681194887 has 12 divisors (see below), whose sum is σ = 714896280. Its totient is φ = 649019888.

The previous prime is 681194791. The next prime is 681194893. The reversal of 681194887 is 788491186.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-681194887 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 (681194287) 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, 139908 + ... + 144694.

It is an arithmetic number, because the mean of its divisors is an integer number (59574690).

Almost surely, 2^681194887 is an apocalyptic number.

681194887 is a deficient number, since it is larger than the sum of its proper divisors (33701393).

681194887 is a wasteful number, since it uses less digits than its factorization.

681194887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5102 (or 5079 counting only the distinct ones).

The product of its digits is 774144, while the sum is 52.

The square root of 681194887 is about 26099.7104773214. The cubic root of 681194887 is about 879.8807030948.

The spelling of 681194887 in words is "six hundred eighty-one million, one hundred ninety-four thousand, eight hundred eighty-seven".