625909 has 2 divisors, whose sum is σ = 625910. Its totient is φ = 625908.

The previous prime is 625883. The next prime is 625913. The reversal of 625909 is 909526.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 483025 + 142884 = 695^2 + 378^2 .

It is a cyclic number.

It is not a de Polignac number, because 625909 - 2⁹ = 625397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625939) 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, 312954 + 312955.

It is an arithmetic number, because the mean of its divisors is an integer number (312955).

2⁶²⁵⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

625909 is a deficient number, since it is larger than the sum of its proper divisors (1).

625909 is an equidigital number, since it uses as much as digits as its factorization.

625909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 625909 is about 791.1441082382. The cubic root of 625909 is about 85.5402270721.

The spelling of 625909 in words is "six hundred twenty-five thousand, nine hundred nine".