625891 has 4 divisors (see below), whose sum is σ = 715312. Its totient is φ = 536472.

The previous prime is 625883. The next prime is 625909. The reversal of 625891 is 198526.

625891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 625891 - 2³ = 625883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (625811) 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, 44700 + ... + 44713.

It is an arithmetic number, because the mean of its divisors is an integer number (178828).

2⁶²⁵⁸⁹¹ is an apocalyptic number.

625891 is a deficient number, since it is larger than the sum of its proper divisors (89421).

625891 is an equidigital number, since it uses as much as digits as its factorization.

625891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89420.

The product of its digits is 4320, while the sum is 31.

The square root of 625891 is about 791.1327322264. The cubic root of 625891 is about 85.5394070707.

The spelling of 625891 in words is "six hundred twenty-five thousand, eight hundred ninety-one".