253211816431 has 4 divisors (see below), whose sum is σ = 289384933072. Its totient is φ = 217038699792.

The previous prime is 253211816423. The next prime is 253211816449. The reversal of 253211816431 is 134618112352.

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 253211816431 - 2³ = 253211816423 is a prime.

It is a super-2 number, since 2×253211816431² (a number of 24 digits) 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 (253211816531) 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, 18086558310 + ... + 18086558323.

It is an arithmetic number, because the mean of its divisors is an integer number (72346233268).

Almost surely, 2^253211816431 is an apocalyptic number.

253211816431 is a deficient number, since it is larger than the sum of its proper divisors (36173116641).

253211816431 is an equidigital number, since it uses as much as digits as its factorization.

253211816431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36173116640.

The product of its digits is 34560, while the sum is 37.

Adding to 253211816431 its reverse (134618112352), we get a palindrome (387829928783).

The spelling of 253211816431 in words is "two hundred fifty-three billion, two hundred eleven million, eight hundred sixteen thousand, four hundred thirty-one".