125391 has 12 divisors (see below), whose sum is σ = 194712. Its totient is φ = 71568.

The previous prime is 125387. The next prime is 125399. The reversal of 125391 is 193521.

It is not a de Polignac number, because 125391 - 2² = 125387 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 125391.

It is not an unprimeable number, because it can be changed into a prime (125399) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 280 + ... + 573.

It is an arithmetic number, because the mean of its divisors is an integer number (16226).

2¹²⁵³⁹¹ is an apocalyptic number.

125391 is a deficient number, since it is larger than the sum of its proper divisors (69321).

125391 is an equidigital number, since it uses as much as digits as its factorization.

125391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870 (or 863 counting only the distinct ones).

The product of its digits is 270, while the sum is 21.

The square root of 125391 is about 354.1059163584. The cubic root of 125391 is about 50.0520790699.

The spelling of 125391 in words is "one hundred twenty-five thousand, three hundred ninety-one".