625826909 has 2 divisors, whose sum is σ = 625826910. Its totient is φ = 625826908.

The previous prime is 625826897. The next prime is 625826939. The reversal of 625826909 is 909628526.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 361114009 + 264712900 = 19003^2 + 16270^2 .

It is a cyclic number.

It is not a de Polignac number, because 625826909 - 2¹⁶ = 625761373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625826939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312913454 + 312913455.

It is an arithmetic number, because the mean of its divisors is an integer number (312913455).

Almost surely, 2^625826909 is an apocalyptic number.

It is an amenable number.

625826909 is a deficient number, since it is larger than the sum of its proper divisors (1).

625826909 is an equidigital number, since it uses as much as digits as its factorization.

625826909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 625826909 is about 25016.5327133878. The cubic root of 625826909 is about 855.3648723679.

The spelling of 625826909 in words is "six hundred twenty-five million, eight hundred twenty-six thousand, nine hundred nine".