23131204155 has 16 divisors (see below), whose sum is σ = 41122140960. Its totient is φ = 12336642144.

The previous prime is 23131204147. The next prime is 23131204157. The reversal of 23131204155 is 55140213132.

23131204155 is a `hidden beast` number, since 231 + 3 + 12 + 0 + 415 + 5 = 666.

It is not a de Polignac number, because 23131204155 - 2³ = 23131204147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (23131204157) 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, 85670992 + ... + 85671261.

It is an arithmetic number, because the mean of its divisors is an integer number (2570133810).

Almost surely, 2^23131204155 is an apocalyptic number.

23131204155 is a deficient number, since it is larger than the sum of its proper divisors (17990936805).

23131204155 is a wasteful number, since it uses less digits than its factorization.

23131204155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171342267 (or 171342261 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 23131204155 its reverse (55140213132), we get a palindrome (78271417287).

The spelling of 23131204155 in words is "twenty-three billion, one hundred thirty-one million, two hundred four thousand, one hundred fifty-five".