12920657 has 2 divisors, whose sum is σ = 12920658. Its totient is φ = 12920656.

The previous prime is 12920653. The next prime is 12920669. The reversal of 12920657 is 75602921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12103441 + 817216 = 3479^2 + 904^2 .

It is a cyclic number.

It is not a de Polignac number, because 12920657 - 2² = 12920653 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12920653) 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, 6460328 + 6460329.

It is an arithmetic number, because the mean of its divisors is an integer number (6460329).

Almost surely, 2^12920657 is an apocalyptic number.

It is an amenable number.

12920657 is a deficient number, since it is larger than the sum of its proper divisors (1).

12920657 is an equidigital number, since it uses as much as digits as its factorization.

12920657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 12920657 is about 3594.5315411052. The cubic root of 12920657 is about 234.6541282883.

The spelling of 12920657 in words is "twelve million, nine hundred twenty thousand, six hundred fifty-seven".