625131209 has 2 divisors, whose sum is σ = 625131210. Its totient is φ = 625131208.

The previous prime is 625131203. The next prime is 625131301. The reversal of 625131209 is 902131526.

625131209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 614891209 + 10240000 = 24797^2 + 3200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-625131209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (625131203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312565604 + 312565605.

It is an arithmetic number, because the mean of its divisors is an integer number (312565605).

Almost surely, 2^625131209 is an apocalyptic number.

It is an amenable number.

625131209 is a deficient number, since it is larger than the sum of its proper divisors (1).

625131209 is an equidigital number, since it uses as much as digits as its factorization.

625131209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 625131209 is about 25002.6240422880. The cubic root of 625131209 is about 855.0477996144.

The spelling of 625131209 in words is "six hundred twenty-five million, one hundred thirty-one thousand, two hundred nine".