625530209 has 2 divisors, whose sum is σ = 625530210. Its totient is φ = 625530208.

The previous prime is 625530197. The next prime is 625530229. The reversal of 625530209 is 902035526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 494083984 + 131446225 = 22228^2 + 11465^2 .

It is a cyclic number.

It is not a de Polignac number, because 625530209 - 2⁸ = 625529953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (625530229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312765104 + 312765105.

It is an arithmetic number, because the mean of its divisors is an integer number (312765105).

Almost surely, 2^625530209 is an apocalyptic number.

It is an amenable number.

625530209 is a deficient number, since it is larger than the sum of its proper divisors (1).

625530209 is an equidigital number, since it uses as much as digits as its factorization.

625530209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 625530209 is about 25010.6019319808. The cubic root of 625530209 is about 855.2296769059.

The spelling of 625530209 in words is "six hundred twenty-five million, five hundred thirty thousand, two hundred nine".