12641917 has 2 divisors, whose sum is σ = 12641918. Its totient is φ = 12641916.

The previous prime is 12641869. The next prime is 12641963. The reversal of 12641917 is 71914621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10536516 + 2105401 = 3246^2 + 1451^2 .

It is a cyclic number.

It is not a de Polignac number, because 12641917 - 2²³ = 4253309 is a prime.

It is equal to p₈₂₇₃₉₂ and since 12641917 and 827392 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12641977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320958 + 6320959.

It is an arithmetic number, because the mean of its divisors is an integer number (6320959).

Almost surely, 2^12641917 is an apocalyptic number.

It is an amenable number.

12641917 is a deficient number, since it is larger than the sum of its proper divisors (1).

12641917 is an equidigital number, since it uses as much as digits as its factorization.

12641917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 12641917 is about 3555.5473558933. The cubic root of 12641917 is about 232.9544324430.

The spelling of 12641917 in words is "twelve million, six hundred forty-one thousand, nine hundred seventeen".