681982831 has 8 divisors (see below), whose sum is σ = 697095360. Its totient is φ = 666895488.

The previous prime is 681982823. The next prime is 681982859. The reversal of 681982831 is 138289186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681982831 - 2³ = 681982823 is a prime.

It is a super-2 number, since 2×681982831² = 930201163557549122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681982811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54955 + ... + 66211.

It is an arithmetic number, because the mean of its divisors is an integer number (87136920).

Almost surely, 2^681982831 is an apocalyptic number.

681982831 is a deficient number, since it is larger than the sum of its proper divisors (15112529).

681982831 is a wasteful number, since it uses less digits than its factorization.

681982831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12593.

The product of its digits is 165888, while the sum is 46.

The square root of 681982831 is about 26114.8009948382. The cubic root of 681982831 is about 880.2198275713.

The spelling of 681982831 in words is "six hundred eighty-one million, nine hundred eighty-two thousand, eight hundred thirty-one".