125139 has 16 divisors (see below), whose sum is σ = 195840. Its totient is φ = 69600.

The previous prime is 125131. The next prime is 125141. The reversal of 125139 is 931521.

It is not a de Polignac number, because 125139 - 2³ = 125131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (125131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1189 + ... + 1289.

It is an arithmetic number, because the mean of its divisors is an integer number (12240).

2¹²⁵¹³⁹ is an apocalyptic number.

125139 is a deficient number, since it is larger than the sum of its proper divisors (70701).

125139 is a wasteful number, since it uses less digits than its factorization.

125139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170.

The product of its digits is 270, while the sum is 21.

The square root of 125139 is about 353.7499116608. The cubic root of 125139 is about 50.0185264679.

It can be divided in two parts, 12 and 5139, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 125139 in words is "one hundred twenty-five thousand, one hundred thirty-nine".