31678681 has 8 divisors (see below), whose sum is σ = 33410720. Its totient is φ = 29953152.

The previous prime is 31678657. The next prime is 31678781. The reversal of 31678681 is 18687613.

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 31678681 - 2⁵ = 31678649 is a prime.

It is a super-2 number, since 2×31678681² = 2007077659799522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31678601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10921 + ... + 13513.

It is an arithmetic number, because the mean of its divisors is an integer number (4176340).

Almost surely, 2^31678681 is an apocalyptic number.

It is an amenable number.

31678681 is a deficient number, since it is larger than the sum of its proper divisors (1732039).

31678681 is a wasteful number, since it uses less digits than its factorization.

31678681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3255.

The product of its digits is 48384, while the sum is 40.

The square root of 31678681 is about 5628.3817390081. The cubic root of 31678681 is about 316.4140043070.

The spelling of 31678681 in words is "thirty-one million, six hundred seventy-eight thousand, six hundred eighty-one".