681374979 has 12 divisors (see below), whose sum is σ = 1036009000. Its totient is φ = 430341984.

The previous prime is 681374963. The next prime is 681374983. The reversal of 681374979 is 979473186.

It is a happy number.

It is not a de Polignac number, because 681374979 - 2⁴ = 681374963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681374929) 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, 1992154 + ... + 1992495.

Almost surely, 2^681374979 is an apocalyptic number.

681374979 is a deficient number, since it is larger than the sum of its proper divisors (354634021).

681374979 is a wasteful number, since it uses less digits than its factorization.

681374979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3984674 (or 3984671 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 681374979 is about 26103.1603259069. The cubic root of 681374979 is about 879.9582362239.

The spelling of 681374979 in words is "six hundred eighty-one million, three hundred seventy-four thousand, nine hundred seventy-nine".