625687801 has 2 divisors, whose sum is σ = 625687802. Its totient is φ = 625687800.

The previous prime is 625687793. The next prime is 625687897. The reversal of 625687801 is 108786526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 624000400 + 1687401 = 24980^2 + 1299^2 .

It is a cyclic number.

It is not a de Polignac number, because 625687801 - 2³ = 625687793 is a prime.

It is not a weakly prime, because it can be changed into another prime (625687001) 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, 312843900 + 312843901.

It is an arithmetic number, because the mean of its divisors is an integer number (312843901).

Almost surely, 2^625687801 is an apocalyptic number.

It is an amenable number.

625687801 is a deficient number, since it is larger than the sum of its proper divisors (1).

625687801 is an equidigital number, since it uses as much as digits as its factorization.

625687801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 625687801 is about 25013.7522375193. The cubic root of 625687801 is about 855.3014912039.

The spelling of 625687801 in words is "six hundred twenty-five million, six hundred eighty-seven thousand, eight hundred one".