23131287 has 12 divisors (see below), whose sum is σ = 33462000. Its totient is φ = 15397728.

The previous prime is 23131249. The next prime is 23131289. The reversal of 23131287 is 78213132.

It is a de Polignac number, because none of the positive numbers 2^k-23131287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23131287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23131289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6214 + ... + 9212.

It is an arithmetic number, because the mean of its divisors is an integer number (2788500).

Almost surely, 2^23131287 is an apocalyptic number.

23131287 is a deficient number, since it is larger than the sum of its proper divisors (10330713).

23131287 is a wasteful number, since it uses less digits than its factorization.

23131287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3862 (or 3859 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 23131287 is about 4809.4996621270. The cubic root of 23131287 is about 284.9267771262.

It can be divided in two parts, 2313 and 1287, that added together give a square (3600 = 60²).

The spelling of 23131287 in words is "twenty-three million, one hundred thirty-one thousand, two hundred eighty-seven".