125431 has 4 divisors (see below), whose sum is σ = 128392. Its totient is φ = 122472.

The previous prime is 125429. The next prime is 125441. The reversal of 125431 is 134521.

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

It is a cyclic number.

It is not a de Polignac number, because 125431 - 2¹ = 125429 is a prime.

It is a super-2 number, since 2×125431² = 31465871522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1416 + ... + 1501.

It is an arithmetic number, because the mean of its divisors is an integer number (32098).

2¹²⁵⁴³¹ is an apocalyptic number.

125431 is a deficient number, since it is larger than the sum of its proper divisors (2961).

125431 is an equidigital number, since it uses as much as digits as its factorization.

125431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2960.

The product of its digits is 120, while the sum is 16.

The square root of 125431 is about 354.1623921311. The cubic root of 125431 is about 50.0574007445.

Adding to 125431 its reverse (134521), we get a palindrome (259952).

It can be divided in two parts, 12543 and 1, that added together give a square (12544 = 112²).

The spelling of 125431 in words is "one hundred twenty-five thousand, four hundred thirty-one".