625814509 has 2 divisors, whose sum is σ = 625814510. Its totient is φ = 625814508.

The previous prime is 625814491. The next prime is 625814531. The reversal of 625814509 is 905418526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 485320900 + 140493609 = 22030^2 + 11853^2 .

It is a cyclic number.

It is not a de Polignac number, because 625814509 - 2¹⁷ = 625683437 is a prime.

It is a super-2 number, since 2×625814509² = 783287599349822162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625814209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312907254 + 312907255.

It is an arithmetic number, because the mean of its divisors is an integer number (312907255).

Almost surely, 2^625814509 is an apocalyptic number.

It is an amenable number.

625814509 is a deficient number, since it is larger than the sum of its proper divisors (1).

625814509 is an equidigital number, since it uses as much as digits as its factorization.

625814509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 625814509 is about 25016.2848760562. The cubic root of 625814509 is about 855.3592229920.

The spelling of 625814509 in words is "six hundred twenty-five million, eight hundred fourteen thousand, five hundred nine".