253633491 has 16 divisors (see below), whose sum is σ = 376089600. Its totient is φ = 168937704.

The previous prime is 253633487. The next prime is 253633493. The reversal of 253633491 is 194336352.

It is a happy number.

253633491 is a `hidden beast` number, since 2 + 536 + 3 + 34 + 91 = 666.

It is not a de Polignac number, because 253633491 - 2² = 253633487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (253633493) 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, 32290 + ... + 39368.

It is an arithmetic number, because the mean of its divisors is an integer number (23505600).

Almost surely, 2^253633491 is an apocalyptic number.

253633491 is a deficient number, since it is larger than the sum of its proper divisors (122456109).

253633491 is a wasteful number, since it uses less digits than its factorization.

253633491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8415 (or 8409 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 253633491 is about 15925.8748896254. The cubic root of 253633491 is about 632.9977987839.

The spelling of 253633491 in words is "two hundred fifty-three million, six hundred thirty-three thousand, four hundred ninety-one".