681241599 has 12 divisors (see below), whose sum is σ = 1035806200. Its totient is φ = 430257744.

The previous prime is 681241579. The next prime is 681241619. The reversal of 681241599 is 995142186.

681241599 is a `hidden beast` number, since 6 + 8 + 12 + 41 + 599 = 666.

It is an interprime number because it is at equal distance from previous prime (681241579) and next prime (681241619).

It is not a de Polignac number, because 681241599 - 2⁷ = 681241471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681241529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1991764 + ... + 1992105.

Almost surely, 2^681241599 is an apocalyptic number.

681241599 is a deficient number, since it is larger than the sum of its proper divisors (354564601).

681241599 is a wasteful number, since it uses less digits than its factorization.

681241599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3983894 (or 3983891 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 681241599 is about 26100.6053378078. The cubic root of 681241599 is about 879.9008148371.

The spelling of 681241599 in words is "six hundred eighty-one million, two hundred forty-one thousand, five hundred ninety-nine".