125655979 has 2 divisors, whose sum is σ = 125655980. Its totient is φ = 125655978.

The previous prime is 125655967. The next prime is 125655997. The reversal of 125655979 is 979556521.

Together with next prime (125655997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125655979 - 2⁷ = 125655851 is a prime.

It is not a weakly prime, because it can be changed into another prime (125655919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62827989 + 62827990.

It is an arithmetic number, because the mean of its divisors is an integer number (62827990).

Almost surely, 2^125655979 is an apocalyptic number.

125655979 is a deficient number, since it is larger than the sum of its proper divisors (1).

125655979 is an equidigital number, since it uses as much as digits as its factorization.

125655979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 850500, while the sum is 49.

The square root of 125655979 is about 11209.6377729167. The cubic root of 125655979 is about 500.8731131261.

The spelling of 125655979 in words is "one hundred twenty-five million, six hundred fifty-five thousand, nine hundred seventy-nine".