625591 has 2 divisors, whose sum is σ = 625592. Its totient is φ = 625590.

The previous prime is 625589. The next prime is 625609. The reversal of 625591 is 195526.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 625591 - 2¹ = 625589 is a prime.

Together with 625589, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312795 + 312796.

It is an arithmetic number, because the mean of its divisors is an integer number (312796).

2⁶²⁵⁵⁹¹ is an apocalyptic number.

625591 is a deficient number, since it is larger than the sum of its proper divisors (1).

625591 is an equidigital number, since it uses as much as digits as its factorization.

625591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 28.

The square root of 625591 is about 790.9431079414. The cubic root of 625591 is about 85.5257380648.

The spelling of 625591 in words is "six hundred twenty-five thousand, five hundred ninety-one".