625581601 has 2 divisors, whose sum is σ = 625581602. Its totient is φ = 625581600.

The previous prime is 625581557. The next prime is 625581611. The reversal of 625581601 is 106185526.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 421234576 + 204347025 = 20524^2 + 14295^2 .

It is a cyclic number.

It is not a de Polignac number, because 625581601 - 2²⁵ = 592027169 is a prime.

It is not a weakly prime, because it can be changed into another prime (625581611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312790800 + 312790801.

It is an arithmetic number, because the mean of its divisors is an integer number (312790801).

Almost surely, 2^625581601 is an apocalyptic number.

It is an amenable number.

625581601 is a deficient number, since it is larger than the sum of its proper divisors (1).

625581601 is an equidigital number, since it uses as much as digits as its factorization.

625581601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 625581601 is about 25011.6293151806. The cubic root of 625581601 is about 855.2530974427.

The spelling of 625581601 in words is "six hundred twenty-five million, five hundred eighty-one thousand, six hundred one".