125612989 has 2 divisors, whose sum is σ = 125612990. Its totient is φ = 125612988.

The previous prime is 125612957. The next prime is 125613073. The reversal of 125612989 is 989216521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110944089 + 14668900 = 10533^2 + 3830^2 .

It is a cyclic number.

It is not a de Polignac number, because 125612989 - 2⁵ = 125612957 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125612939) 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, 62806494 + 62806495.

It is an arithmetic number, because the mean of its divisors is an integer number (62806495).

Almost surely, 2^125612989 is an apocalyptic number.

It is an amenable number.

125612989 is a deficient number, since it is larger than the sum of its proper divisors (1).

125612989 is an equidigital number, since it uses as much as digits as its factorization.

125612989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 43.

The square root of 125612989 is about 11207.7200625283. The cubic root of 125612989 is about 500.8159862750.

The spelling of 125612989 in words is "one hundred twenty-five million, six hundred twelve thousand, nine hundred eighty-nine".