253635431 has 4 divisors (see below), whose sum is σ = 289869072. Its totient is φ = 217401792.

The previous prime is 253635413. The next prime is 253635433. The reversal of 253635431 is 134536352.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253635431 is a prime.

It is a super-2 number, since 2×253635431² = 128661863717111522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253635433) 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 3 ways as a sum of consecutive naturals, for example, 18116810 + ... + 18116823.

It is an arithmetic number, because the mean of its divisors is an integer number (72467268).

Almost surely, 2^253635431 is an apocalyptic number.

253635431 is a deficient number, since it is larger than the sum of its proper divisors (36233641).

253635431 is an equidigital number, since it uses as much as digits as its factorization.

253635431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36233640.

The product of its digits is 32400, while the sum is 32.

The square root of 253635431 is about 15925.9357966808. The cubic root of 253635431 is about 632.9994126778. Note that the first 3 decimals are identical.

The spelling of 253635431 in words is "two hundred fifty-three million, six hundred thirty-five thousand, four hundred thirty-one".