681931396 has 12 divisors (see below), whose sum is σ = 1205196300. Its totient is φ = 337589600.

The previous prime is 681931391. The next prime is 681931399. The reversal of 681931396 is 693139186.

It can be written as a sum of positive squares in 2 ways, for example, as 415588996 + 266342400 = 20386^2 + 16320^2 .

It is not an unprimeable number, because it can be changed into a prime (681931391) 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, 843571 + ... + 844378.

It is an arithmetic number, because the mean of its divisors is an integer number (100433025).

Almost surely, 2^681931396 is an apocalyptic number.

It is an amenable number.

681931396 is a deficient number, since it is larger than the sum of its proper divisors (523264904).

681931396 is a wasteful number, since it uses less digits than its factorization.

681931396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688054 (or 1688052 counting only the distinct ones).

The product of its digits is 209952, while the sum is 46.

The square root of 681931396 is about 26113.8161899022. The cubic root of 681931396 is about 880.1976983509.

The spelling of 681931396 in words is "six hundred eighty-one million, nine hundred thirty-one thousand, three hundred ninety-six".