23131231 has 2 divisors, whose sum is σ = 23131232. Its totient is φ = 23131230.

The previous prime is 23131211. The next prime is 23131249. The reversal of 23131231 is 13213132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23131231 - 2⁷ = 23131103 is a prime.

It is a super-2 number, since 2×23131231² = 1070107695150722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23131211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565615 + 11565616.

It is an arithmetic number, because the mean of its divisors is an integer number (11565616).

Almost surely, 2^23131231 is an apocalyptic number.

23131231 is a deficient number, since it is larger than the sum of its proper divisors (1).

23131231 is an equidigital number, since it uses as much as digits as its factorization.

23131231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 16.

The square root of 23131231 is about 4809.4938403121. The cubic root of 23131231 is about 284.9265471936.

Adding to 23131231 its reverse (13213132), we get a palindrome (36344363).

The spelling of 23131231 in words is "twenty-three million, one hundred thirty-one thousand, two hundred thirty-one".