23131339987 has 24 divisors (see below), whose sum is σ = 27724653600. Its totient is φ = 19290610080.

The previous prime is 23131339961. The next prime is 23131339999. The reversal of 23131339987 is 78993313132.

It is a de Polignac number, because none of the positive numbers 2^k-23131339987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 23131339987.

It is not an unprimeable number, because it can be changed into a prime (23131339927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 444937 + ... + 494197.

It is an arithmetic number, because the mean of its divisors is an integer number (1155193900).

Almost surely, 2^23131339987 is an apocalyptic number.

23131339987 is a deficient number, since it is larger than the sum of its proper divisors (4593313613).

23131339987 is an frugal number, since it uses more digits than its factorization.

23131339987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49356 (or 49305 counting only the distinct ones).

The product of its digits is 734832, while the sum is 49.

The spelling of 23131339987 in words is "twenty-three billion, one hundred thirty-one million, three hundred thirty-nine thousand, nine hundred eighty-seven".