125109 has 6 divisors (see below), whose sum is σ = 180726. Its totient is φ = 83400.

The previous prime is 125107. The next prime is 125113. The reversal of 125109 is 901521.

It can be written as a sum of positive squares in only one way, i.e., 119025 + 6084 = 345^2 + 78^2 .

It is not a de Polignac number, because 125109 - 2¹ = 125107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 125091 and 125100.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 125109.

It is not an unprimeable number, because it can be changed into a prime (125101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6942 + ... + 6959.

It is an arithmetic number, because the mean of its divisors is an integer number (30121).

2¹²⁵¹⁰⁹ is an apocalyptic number.

It is an amenable number.

125109 is a deficient number, since it is larger than the sum of its proper divisors (55617).

125109 is a wasteful number, since it uses less digits than its factorization.

125109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13907 (or 13904 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 125109 is about 353.7075062817. The cubic root of 125109 is about 50.0145291110.

The spelling of 125109 in words is "one hundred twenty-five thousand, one hundred nine".