681313599 has 20 divisors (see below), whose sum is σ = 1031715696. Its totient is φ = 447983136.

The previous prime is 681313583. The next prime is 681313603. The reversal of 681313599 is 995313186.

It is not a de Polignac number, because 681313599 - 2⁴ = 681313583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681353599) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 51699 + ... + 63524.

Almost surely, 2^681313599 is an apocalyptic number.

681313599 is a deficient number, since it is larger than the sum of its proper divisors (350402097).

681313599 is a wasteful number, since it uses less digits than its factorization.

681313599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115308 (or 115299 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 681313599 is about 26101.9845797211. The cubic root of 681313599 is about 879.9318124679.

The spelling of 681313599 in words is "six hundred eighty-one million, three hundred thirteen thousand, five hundred ninety-nine".