125839731 has 4 divisors (see below), whose sum is σ = 167786312. Its totient is φ = 83893152.

The previous prime is 125839697. The next prime is 125839733. The reversal of 125839731 is 137938521.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 125839731 - 2¹³ = 125831539 is a prime.

It is a super-2 number, since 2×125839731² = 31671275796304722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125839731.

It is not an unprimeable number, because it can be changed into a prime (125839733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20973286 + ... + 20973291.

It is an arithmetic number, because the mean of its divisors is an integer number (41946578).

Almost surely, 2^125839731 is an apocalyptic number.

125839731 is a deficient number, since it is larger than the sum of its proper divisors (41946581).

125839731 is an equidigital number, since it uses as much as digits as its factorization.

125839731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41946580.

The product of its digits is 45360, while the sum is 39.

The square root of 125839731 is about 11217.8309400704. The cubic root of 125839731 is about 501.1171434554.

The spelling of 125839731 in words is "one hundred twenty-five million, eight hundred thirty-nine thousand, seven hundred thirty-one".