391125 has 32 divisors (see below), whose sum is σ = 748800. Its totient is φ = 177600.

The previous prime is 391117. The next prime is 391133. The reversal of 391125 is 521193.

It is an interprime number because it is at equal distance from previous prime (391117) and next prime (391133).

It is not a de Polignac number, because 391125 - 2³ = 391117 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2551 + ... + 2699.

It is an arithmetic number, because the mean of its divisors is an integer number (23400).

2³⁹¹¹²⁵ is an apocalyptic number.

391125 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

391125 is a deficient number, since it is larger than the sum of its proper divisors (357675).

391125 is a wasteful number, since it uses less digits than its factorization.

391125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 164 counting only the distinct ones).

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

The square root of 391125 is about 625.3998720819. The cubic root of 391125 is about 73.1316196798.

The spelling of 391125 in words is "three hundred ninety-one thousand, one hundred twenty-five".