23122131 has 4 divisors (see below), whose sum is σ = 30829512. Its totient is φ = 15414752.

The previous prime is 23122123. The next prime is 23122133. The reversal of 23122131 is 13122132.

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

It is a cyclic number.

It is not a de Polignac number, because 23122131 - 2³ = 23122123 is a prime.

It is a super-2 number, since 2×23122131² = 1069265883962322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23122131.

It is not an unprimeable number, because it can be changed into a prime (23122133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3853686 + ... + 3853691.

It is an arithmetic number, because the mean of its divisors is an integer number (7707378).

Almost surely, 2^23122131 is an apocalyptic number.

23122131 is a deficient number, since it is larger than the sum of its proper divisors (7707381).

23122131 is an equidigital number, since it uses as much as digits as its factorization.

23122131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7707380.

The product of its digits is 72, while the sum is 15.

The square root of 23122131 is about 4808.5477017495. The cubic root of 23122131 is about 284.8891782116.

Adding to 23122131 its reverse (13122132), we get a palindrome (36244263).

Subtracting from 23122131 its reverse (13122132), we obtain a palindrome (9999999).

The spelling of 23122131 in words is "twenty-three million, one hundred twenty-two thousand, one hundred thirty-one".