681793156 has 12 divisors (see below), whose sum is σ = 1301605200. Its totient is φ = 309905960.

The previous prime is 681793121. The next prime is 681793201. The reversal of 681793156 is 651397186.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7747606 + ... + 7747693.

It is an arithmetic number, because the mean of its divisors is an integer number (108467100).

Almost surely, 2^681793156 is an apocalyptic number.

It is an amenable number.

681793156 is a deficient number, since it is larger than the sum of its proper divisors (619812044).

681793156 is a wasteful number, since it uses less digits than its factorization.

681793156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15495314 (or 15495312 counting only the distinct ones).

The product of its digits is 272160, while the sum is 46.

The square root of 681793156 is about 26111.1691810229. The cubic root of 681793156 is about 880.1382169262.

The spelling of 681793156 in words is "six hundred eighty-one million, seven hundred ninety-three thousand, one hundred fifty-six".