Exopolyphosphatase that catalyzes the hydrolysis of inorganic polyphosphates, with preference for short-chain substrates, as well as nucleoside 5'-tetraphosphates, releasing terminal phosphate residues (PubMed:18700747). Also exhibits phosphodiesterase activity toward cyclic nucleotides, hydrolyzing cAMP and cGMP to their corresponding 5'-monophosphates (PubMed:14998490, PubMed:17655525). Requires divalent metal ions for activity (PubMed:14998490, PubMed:18700747). Plays a role in cell proliferation, migration and differentiation, and acts as a negative regulator of NME1 (PubMed:10602478, PubMed:11687967, PubMed:14998490, PubMed:16428445, PubMed:17906697). Plays a role in the regulation of neurogenesis. Involved in the regulation of microtubule polymerization (PubMed:28334956). {ECO:0000269|PubMed:10602478, ECO:0000269|PubMed:11687967, ECO:0000269|PubMed:14998490, ECO:0000269|PubMed:16428445, ECO:0000269|PubMed:17655525, ECO:0000269|PubMed:17906697, ECO:0000269|PubMed:18700747, ECO:0000269|PubMed:28334956}. This is the function of ENSG00000143363 (PRUNE1, prune exopolyphosphatase 1).