625589 has 2 divisors, whose sum is σ = 625590. Its totient is φ = 625588.

The previous prime is 625543. The next prime is 625591. The reversal of 625589 is 985526.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 600625 + 24964 = 775^2 + 158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-625589 is a prime.

It is a Sophie Germain prime.

Together with 625591, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312794 + 312795.

It is an arithmetic number, because the mean of its divisors is an integer number (312795).

2⁶²⁵⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

625589 is a deficient number, since it is larger than the sum of its proper divisors (1).

625589 is an equidigital number, since it uses as much as digits as its factorization.

625589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 35.

The square root of 625589 is about 790.9418436270. The cubic root of 625589 is about 85.5256469235.

The spelling of 625589 in words is "six hundred twenty-five thousand, five hundred eighty-nine".