681316894 has 24 divisors (see below), whose sum is σ = 1069949160. Its totient is φ = 324996672.

The previous prime is 681316891. The next prime is 681316919. The reversal of 681316894 is 498613186.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681316891) 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, 458677 + ... + 460159.

It is an arithmetic number, because the mean of its divisors is an integer number (44581215).

Almost surely, 2^681316894 is an apocalyptic number.

681316894 is a deficient number, since it is larger than the sum of its proper divisors (388632266).

681316894 is a wasteful number, since it uses less digits than its factorization.

681316894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692 (or 1603 counting only the distinct ones).

The product of its digits is 248832, while the sum is 46.

The square root of 681316894 is about 26102.0476974509. The cubic root of 681316894 is about 879.9332309878.

The spelling of 681316894 in words is "six hundred eighty-one million, three hundred sixteen thousand, eight hundred ninety-four".