31317986 has 8 divisors (see below), whose sum is σ = 53688000. Its totient is φ = 13421988.

The previous prime is 31317983. The next prime is 31318003. The reversal of 31317986 is 68971313.

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

It is not an unprimeable number, because it can be changed into a prime (31317983) 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, 1118486 + ... + 1118513.

It is an arithmetic number, because the mean of its divisors is an integer number (6711000).

Almost surely, 2^31317986 is an apocalyptic number.

31317986 is a deficient number, since it is larger than the sum of its proper divisors (22370014).

31317986 is a wasteful number, since it uses less digits than its factorization.

31317986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2237008.

The product of its digits is 27216, while the sum is 38.

The square root of 31317986 is about 5596.2474927401. The cubic root of 31317986 is about 315.2085156747.

The spelling of 31317986 in words is "thirty-one million, three hundred seventeen thousand, nine hundred eighty-six".