252505491 has 16 divisors (see below), whose sum is σ = 385054464. Its totient is φ = 144182304.

The previous prime is 252505483. The next prime is 252505507. The reversal of 252505491 is 194505252.

It is not a de Polignac number, because 252505491 - 2³ = 252505483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (252505411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31401 + ... + 38613.

It is an arithmetic number, because the mean of its divisors is an integer number (24065904).

Almost surely, 2^252505491 is an apocalyptic number.

252505491 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

252505491 is a deficient number, since it is larger than the sum of its proper divisors (132548973).

252505491 is a wasteful number, since it uses less digits than its factorization.

252505491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8890.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 252505491 is about 15890.4213600521. The cubic root of 252505491 is about 632.0580140557.

The spelling of 252505491 in words is "two hundred fifty-two million, five hundred five thousand, four hundred ninety-one".