12523681 has 2 divisors, whose sum is σ = 12523682. Its totient is φ = 12523680.

The previous prime is 12523669. The next prime is 12523691. The reversal of 12523681 is 18632521.

12523681 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9579025 + 2944656 = 3095^2 + 1716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12523681 is a prime.

It is a super-2 number, since 2×12523681² = 313685171579522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12523691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6261840 + 6261841.

It is an arithmetic number, because the mean of its divisors is an integer number (6261841).

Almost surely, 2^12523681 is an apocalyptic number.

It is an amenable number.

12523681 is a deficient number, since it is larger than the sum of its proper divisors (1).

12523681 is an equidigital number, since it uses as much as digits as its factorization.

12523681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 12523681 is about 3538.8813204175. The cubic root of 12523681 is about 232.2259058486.

The spelling of 12523681 in words is "twelve million, five hundred twenty-three thousand, six hundred eighty-one".