125124109 has 16 divisors (see below), whose sum is σ = 140969664. Its totient is φ = 110073600.

The previous prime is 125124107. The next prime is 125124113. The reversal of 125124109 is 901421521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 125124109 - 2¹ = 125124107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125124107) 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, 52279 + ... + 54619.

It is an arithmetic number, because the mean of its divisors is an integer number (8810604).

Almost surely, 2^125124109 is an apocalyptic number.

It is an amenable number.

125124109 is a deficient number, since it is larger than the sum of its proper divisors (15845555).

125124109 is a wasteful number, since it uses less digits than its factorization.

125124109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2508.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 125124109 is about 11185.8888337047. Note that the first 4 decimals coincide. The cubic root of 125124109 is about 500.1654239305.

The spelling of 125124109 in words is "one hundred twenty-five million, one hundred twenty-four thousand, one hundred nine".