23131212331 has 4 divisors (see below), whose sum is σ = 23355787312. Its totient is φ = 22906637352.

The previous prime is 23131212311. The next prime is 23131212341. The reversal of 23131212331 is 13321213132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23131212331 is a prime.

It is a super-2 number, since 2×23131212331² (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 (23131212311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112287336 + ... + 112287541.

It is an arithmetic number, because the mean of its divisors is an integer number (5838946828).

Almost surely, 2^23131212331 is an apocalyptic number.

23131212331 is a deficient number, since it is larger than the sum of its proper divisors (224574981).

23131212331 is a wasteful number, since it uses less digits than its factorization.

23131212331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224574980.

The product of its digits is 648, while the sum is 22.

Adding to 23131212331 its reverse (13321213132), we get a palindrome (36452425463).

The spelling of 23131212331 in words is "twenty-three billion, one hundred thirty-one million, two hundred twelve thousand, three hundred thirty-one".