126812557 has 2 divisors, whose sum is σ = 126812558. Its totient is φ = 126812556.

The previous prime is 126812527. The next prime is 126812573. The reversal of 126812557 is 755218621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76983076 + 49829481 = 8774^2 + 7059^2 .

It is a cyclic number.

It is not a de Polignac number, because 126812557 - 2⁷ = 126812429 is a prime.

It is a super-2 number, since 2×126812557² = 32162849225756498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126812507) 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, 63406278 + 63406279.

It is an arithmetic number, because the mean of its divisors is an integer number (63406279).

Almost surely, 2^126812557 is an apocalyptic number.

It is an amenable number.

126812557 is a deficient number, since it is larger than the sum of its proper divisors (1).

126812557 is an equidigital number, since it uses as much as digits as its factorization.

126812557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 37.

The square root of 126812557 is about 11261.1081603899. The cubic root of 126812557 is about 502.4051545786.

The spelling of 126812557 in words is "one hundred twenty-six million, eight hundred twelve thousand, five hundred fifty-seven".