125431165 has 4 divisors (see below), whose sum is σ = 150517404. Its totient is φ = 100344928.

The previous prime is 125431157. The next prime is 125431181. The reversal of 125431165 is 561134521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23299929 + 102131236 = 4827^2 + 10106^2 .

It is a cyclic number.

It is not a de Polignac number, because 125431165 - 2³ = 125431157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12543112 + ... + 12543121.

It is an arithmetic number, because the mean of its divisors is an integer number (37629351).

Almost surely, 2^125431165 is an apocalyptic number.

It is an amenable number.

125431165 is a deficient number, since it is larger than the sum of its proper divisors (25086239).

125431165 is an equidigital number, since it uses as much as digits as its factorization.

125431165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25086238.

The product of its digits is 3600, while the sum is 28.

The square root of 125431165 is about 11199.6055734119. The cubic root of 125431165 is about 500.5742269410.

Adding to 125431165 its reverse (561134521), we get a palindrome (686565686).

The spelling of 125431165 in words is "one hundred twenty-five million, four hundred thirty-one thousand, one hundred sixty-five".