253664531 has 4 divisors (see below), whose sum is σ = 268585992. Its totient is φ = 238743072.

The previous prime is 253664501. The next prime is 253664549. The reversal of 253664531 is 135466352.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 253664531 - 2¹⁰ = 253663507 is a prime.

It is a super-2 number, since 2×253664531² = 128691388574899922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 253664491 and 253664500.

It is not an unprimeable number, because it can be changed into a prime (253664501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7460705 + ... + 7460738.

It is an arithmetic number, because the mean of its divisors is an integer number (67146498).

Almost surely, 2^253664531 is an apocalyptic number.

253664531 is a deficient number, since it is larger than the sum of its proper divisors (14921461).

253664531 is a wasteful number, since it uses less digits than its factorization.

253664531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14921460.

The product of its digits is 64800, while the sum is 35.

The square root of 253664531 is about 15926.8493745624. The cubic root of 253664531 is about 633.0236200981.

The spelling of 253664531 in words is "two hundred fifty-three million, six hundred sixty-four thousand, five hundred thirty-one".