125504639 has 12 divisors (see below), whose sum is σ = 136261800. Its totient is φ = 115543584.

The previous prime is 125504609. The next prime is 125504651. The reversal of 125504639 is 936405521.

It is a de Polignac number, because none of the positive numbers 2^k-125504639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125504599 and 125504608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125504609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85292 + ... + 86750.

It is an arithmetic number, because the mean of its divisors is an integer number (11355150).

Almost surely, 2^125504639 is an apocalyptic number.

125504639 is a deficient number, since it is larger than the sum of its proper divisors (10757161).

125504639 is a wasteful number, since it uses less digits than its factorization.

125504639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994 (or 1981 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 125504639 is about 11202.8852979935. The cubic root of 125504639 is about 500.6719485657.

The spelling of 125504639 in words is "one hundred twenty-five million, five hundred four thousand, six hundred thirty-nine".