23155642531 has 4 divisors (see below), whose sum is σ = 26463591472. Its totient is φ = 19847693592.

The previous prime is 23155642501. The next prime is 23155642537. The reversal of 23155642531 is 13524655132.

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 23155642531 - 2¹⁷ = 23155511459 is a prime.

It is a super-2 number, since 2×23155642531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23155642537) 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, 1653974460 + ... + 1653974473.

It is an arithmetic number, because the mean of its divisors is an integer number (6615897868).

Almost surely, 2^23155642531 is an apocalyptic number.

23155642531 is a deficient number, since it is larger than the sum of its proper divisors (3307948941).

23155642531 is an equidigital number, since it uses as much as digits as its factorization.

23155642531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3307948940.

The product of its digits is 108000, while the sum is 37.

The spelling of 23155642531 in words is "twenty-three billion, one hundred fifty-five million, six hundred forty-two thousand, five hundred thirty-one".