252490491 has 18 divisors (see below), whose sum is σ = 398113092. Its totient is φ = 152928720.

The previous prime is 252490471. The next prime is 252490517. The reversal of 252490491 is 194094252.

252490491 is a `hidden beast` number, since 2 + 524 + 90 + 49 + 1 = 666.

It is not a de Polignac number, because 252490491 - 2²² = 248296187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (252490471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 157305 + ... + 158901.

It is an arithmetic number, because the mean of its divisors is an integer number (22117394).

Almost surely, 2^252490491 is an apocalyptic number.

252490491 is a deficient number, since it is larger than the sum of its proper divisors (145622601).

252490491 is an equidigital number, since it uses as much as digits as its factorization.

252490491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3211 (or 1611 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 252490491 is about 15889.9493705927. The cubic root of 252490491 is about 632.0454980798.

The spelling of 252490491 in words is "two hundred fifty-two million, four hundred ninety thousand, four hundred ninety-one".