31680986 has 4 divisors (see below), whose sum is σ = 47521482. Its totient is φ = 15840492.

The previous prime is 31680931. The next prime is 31681007. The reversal of 31680986 is 68908613.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 30195025 + 1485961 = 5495^2 + 1219^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7920245 + ... + 7920248.

Almost surely, 2^31680986 is an apocalyptic number.

31680986 is a deficient number, since it is larger than the sum of its proper divisors (15840496).

31680986 is a wasteful number, since it uses less digits than its factorization.

31680986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15840495.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 31680986 is about 5628.5865010676. The cubic root of 31680986 is about 316.4216784122.

The spelling of 31680986 in words is "thirty-one million, six hundred eighty thousand, nine hundred eighty-six".