23131681 has 2 divisors, whose sum is σ = 23131682. Its totient is φ = 23131680.

The previous prime is 23131651. The next prime is 23131699. The reversal of 23131681 is 18613132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22886656 + 245025 = 4784^2 + 495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23131681 is a prime.

It is a super-2 number, since 2×23131681² = 1070149331771522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23131601) 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 as a sum of consecutive naturals, namely, 11565840 + 11565841.

It is an arithmetic number, because the mean of its divisors is an integer number (11565841).

Almost surely, 2^23131681 is an apocalyptic number.

It is an amenable number.

23131681 is a deficient number, since it is larger than the sum of its proper divisors (1).

23131681 is an equidigital number, since it uses as much as digits as its factorization.

23131681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 23131681 is about 4809.5406225543. The cubic root of 23131681 is about 284.9283948560.

The spelling of 23131681 in words is "twenty-three million, one hundred thirty-one thousand, six hundred eighty-one".