23131181 has 2 divisors, whose sum is σ = 23131182. Its totient is φ = 23131180.

The previous prime is 23131111. The next prime is 23131193. The reversal of 23131181 is 18113132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14668900 + 8462281 = 3830^2 + 2909^2 .

It is a cyclic number.

It is not a de Polignac number, because 23131181 - 2¹⁸ = 22869037 is a prime.

It is a super-2 number, since 2×23131181² = 1070103068909522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23131111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565590 + 11565591.

It is an arithmetic number, because the mean of its divisors is an integer number (11565591).

Almost surely, 2^23131181 is an apocalyptic number.

It is an amenable number.

23131181 is a deficient number, since it is larger than the sum of its proper divisors (1).

23131181 is an equidigital number, since it uses as much as digits as its factorization.

23131181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 20.

The square root of 23131181 is about 4809.4886422571. The cubic root of 23131181 is about 284.9263418963.

The spelling of 23131181 in words is "twenty-three million, one hundred thirty-one thousand, one hundred eighty-one".