625154609 has 2 divisors, whose sum is σ = 625154610. Its totient is φ = 625154608.

The previous prime is 625154603. The next prime is 625154623. The reversal of 625154609 is 906451526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 331786225 + 293368384 = 18215^2 + 17128^2 .

It is a cyclic number.

It is not a de Polignac number, because 625154609 - 2²⁰ = 624106033 is a prime.

It is not a weakly prime, because it can be changed into another prime (625154603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312577304 + 312577305.

It is an arithmetic number, because the mean of its divisors is an integer number (312577305).

Almost surely, 2^625154609 is an apocalyptic number.

It is an amenable number.

625154609 is a deficient number, since it is larger than the sum of its proper divisors (1).

625154609 is an equidigital number, since it uses as much as digits as its factorization.

625154609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 625154609 is about 25003.0919887921. The cubic root of 625154609 is about 855.0584682381.

The spelling of 625154609 in words is "six hundred twenty-five million, one hundred fifty-four thousand, six hundred nine".