125726121 has 16 divisors (see below), whose sum is σ = 186433600. Its totient is φ = 83739744.

The previous prime is 125726099. The next prime is 125726129. The reversal of 125726121 is 121627521.

125726121 is a `hidden beast` number, since 12 + 572 + 61 + 21 = 666.

It is not a de Polignac number, because 125726121 - 2⁶ = 125726057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125726129) 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, 56610 + ... + 58788.

It is an arithmetic number, because the mean of its divisors is an integer number (11652100).

Almost surely, 2^125726121 is an apocalyptic number.

It is an amenable number.

125726121 is a deficient number, since it is larger than the sum of its proper divisors (60707479).

125726121 is a wasteful number, since it uses less digits than its factorization.

125726121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4325 (or 4319 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 125726121 is about 11212.7659834672. The cubic root of 125726121 is about 500.9662926872.

The spelling of 125726121 in words is "one hundred twenty-five million, seven hundred twenty-six thousand, one hundred twenty-one".