23309891431 has 4 divisors (see below), whose sum is σ = 23310423864. Its totient is φ = 23309359000.

The previous prime is 23309891419. The next prime is 23309891453. The reversal of 23309891431 is 13419890332.

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 23309891431 - 2⁵ = 23309891399 is a prime.

It is a super-2 number, since 2×23309891431² (a number of 22 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 (23309895431) 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, 194020 + ... + 290281.

It is an arithmetic number, because the mean of its divisors is an integer number (5827605966).

Almost surely, 2^23309891431 is an apocalyptic number.

23309891431 is a deficient number, since it is larger than the sum of its proper divisors (532433).

23309891431 is an equidigital number, since it uses as much as digits as its factorization.

23309891431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532432.

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 23309891431 in words is "twenty-three billion, three hundred nine million, eight hundred ninety-one thousand, four hundred thirty-one".