12540641 has 2 divisors, whose sum is σ = 12540642. Its totient is φ = 12540640.

The previous prime is 12540623. The next prime is 12540653. The reversal of 12540641 is 14604521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10863616 + 1677025 = 3296^2 + 1295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12540641 is a prime.

It is a Chen prime.

It is equal to p₈₂₁₁₇₄ and since 12540641 and 821174 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12540601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6270320 + 6270321.

It is an arithmetic number, because the mean of its divisors is an integer number (6270321).

Almost surely, 2^12540641 is an apocalyptic number.

It is an amenable number.

12540641 is a deficient number, since it is larger than the sum of its proper divisors (1).

12540641 is an equidigital number, since it uses as much as digits as its factorization.

12540641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 12540641 is about 3541.2767471634. The cubic root of 12540641 is about 232.3306880021.

The spelling of 12540641 in words is "twelve million, five hundred forty thousand, six hundred forty-one".