31688671 has 8 divisors (see below), whose sum is σ = 36568064. Its totient is φ = 26897400.

The previous prime is 31688633. The next prime is 31688681. The reversal of 31688671 is 17688613.

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 31688671 - 2⁷ = 31688543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31688611) 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, 21255 + ... + 22696.

It is an arithmetic number, because the mean of its divisors is an integer number (4571008).

Almost surely, 2^31688671 is an apocalyptic number.

31688671 is a deficient number, since it is larger than the sum of its proper divisors (4879393).

31688671 is a wasteful number, since it uses less digits than its factorization.

31688671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44061.

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

The square root of 31688671 is about 5629.2691355095. The cubic root of 31688671 is about 316.4472616227.

The spelling of 31688671 in words is "thirty-one million, six hundred eighty-eight thousand, six hundred seventy-one".