125609979 has 24 divisors (see below), whose sum is σ = 184874256. Its totient is φ = 75803200.

The previous prime is 125609977. The next prime is 125609983. The reversal of 125609979 is 979906521.

It is not a de Polignac number, because 125609979 - 2¹ = 125609977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125609977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105769 + ... + 106949.

It is an arithmetic number, because the mean of its divisors is an integer number (7703094).

Almost surely, 2^125609979 is an apocalyptic number.

125609979 is a deficient number, since it is larger than the sum of its proper divisors (59264277).

125609979 is a wasteful number, since it uses less digits than its factorization.

125609979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499 (or 1488 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 48.

The square root of 125609979 is about 11207.5857792836. The cubic root of 125609979 is about 500.8119859771.

The spelling of 125609979 in words is "one hundred twenty-five million, six hundred nine thousand, nine hundred seventy-nine".