125731889 has 2 divisors, whose sum is σ = 125731890. Its totient is φ = 125731888.

The previous prime is 125731861. The next prime is 125731913. The reversal of 125731889 is 988137521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125059489 + 672400 = 11183^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 125731889 - 2²⁴ = 108954673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125731589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62865944 + 62865945.

It is an arithmetic number, because the mean of its divisors is an integer number (62865945).

Almost surely, 2^125731889 is an apocalyptic number.

It is an amenable number.

125731889 is a deficient number, since it is larger than the sum of its proper divisors (1).

125731889 is an equidigital number, since it uses as much as digits as its factorization.

125731889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 44.

The square root of 125731889 is about 11213.0231873478. The cubic root of 125731889 is about 500.9739535969.

The spelling of 125731889 in words is "one hundred twenty-five million, seven hundred thirty-one thousand, eight hundred eighty-nine".