681802977 has 4 divisors (see below), whose sum is σ = 909070640. Its totient is φ = 454535316.

The previous prime is 681802951. The next prime is 681802987. The reversal of 681802977 is 779208186.

681802977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-681802977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681802987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113633827 + ... + 113633832.

It is an arithmetic number, because the mean of its divisors is an integer number (227267660).

Almost surely, 2^681802977 is an apocalyptic number.

It is an amenable number.

681802977 is a deficient number, since it is larger than the sum of its proper divisors (227267663).

681802977 is a wasteful number, since it uses less digits than its factorization.

681802977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227267662.

The product of its (nonzero) digits is 338688, while the sum is 48.

The square root of 681802977 is about 26111.3572416296. The cubic root of 681802977 is about 880.1424429371.

The spelling of 681802977 in words is "six hundred eighty-one million, eight hundred two thousand, nine hundred seventy-seven".