125568639 has 48 divisors (see below), whose sum is σ = 215368192. Its totient is φ = 69004224.

The previous prime is 125568629. The next prime is 125568659. The reversal of 125568639 is 936865521.

125568639 is a `hidden beast` number, since 1 + 2 + 5 + 5 + 6 + 8 + 639 = 666.

It is not a de Polignac number, because 125568639 - 2²⁰ = 124520063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125568594 and 125568603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125568629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 239832 + ... + 240354.

Almost surely, 2^125568639 is an apocalyptic number.

125568639 is a deficient number, since it is larger than the sum of its proper divisors (89799553).

125568639 is a wasteful number, since it uses less digits than its factorization.

125568639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676 (or 673 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The square root of 125568639 is about 11205.7413409377. The cubic root of 125568639 is about 500.7570385401.

The spelling of 125568639 in words is "one hundred twenty-five million, five hundred sixty-eight thousand, six hundred thirty-nine".