The function of Ensembl gene identifier ENSG00000170191 (NANP, N-acetylneuraminic acid phosphatase) is as follows. Catalyzes the dephosphorylation of N-acylneuraminate 9- phosphate (Neu5Ac-9-P) to N-acetylneuraminic acid (Neu5Ac or sialic acid) (PubMed:14235556, PubMed:16237198, PubMed:23747226). Can also use N-glycoloylneuraminate 9-phosphate as substrate (PubMed:14235556). {ECO:0000269|PubMed:14235556, ECO:0000269|PubMed:16237198, ECO:0000269|PubMed:23747226}.