625343909 has 2 divisors, whose sum is σ = 625343910. Its totient is φ = 625343908.

The previous prime is 625343893. The next prime is 625343933. The reversal of 625343909 is 909343526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 584575684 + 40768225 = 24178^2 + 6385^2 .

It is a cyclic number.

It is not a de Polignac number, because 625343909 - 2⁴ = 625343893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625343989) 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, 312671954 + 312671955.

It is an arithmetic number, because the mean of its divisors is an integer number (312671955).

Almost surely, 2^625343909 is an apocalyptic number.

It is an amenable number.

625343909 is a deficient number, since it is larger than the sum of its proper divisors (1).

625343909 is an equidigital number, since it uses as much as digits as its factorization.

625343909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 41.

The square root of 625343909 is about 25006.8772340730. The cubic root of 625343909 is about 855.1447648815.

The spelling of 625343909 in words is "six hundred twenty-five million, three hundred forty-three thousand, nine hundred nine".