23131291 has 8 divisors (see below), whose sum is σ = 23996720. Its totient is φ = 22280832.

The previous prime is 23131289. The next prime is 23131333. The reversal of 23131291 is 19213132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23131291 - 2¹ = 23131289 is a prime.

It is the 4810-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23131211) by changing a digit.

It is a nontrivial repunit in base 4809.

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 7 ways as a sum of consecutive naturals, for example, 546 + ... + 6823.

It is an arithmetic number, because the mean of its divisors is an integer number (2999590).

Almost surely, 2^23131291 is an apocalyptic number.

23131291 is a deficient number, since it is larger than the sum of its proper divisors (865429).

23131291 is an equidigital number, since it uses as much as digits as its factorization.

23131291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7485.

The product of its digits is 324, while the sum is 22.

The square root of 23131291 is about 4809.5000779707. The cubic root of 23131291 is about 284.9267935500.

The spelling of 23131291 in words is "twenty-three million, one hundred thirty-one thousand, two hundred ninety-one".