31679985 has 32 divisors (see below), whose sum is σ = 52743168. Its totient is φ = 16220160.

The previous prime is 31679981. The next prime is 31680001. The reversal of 31679985 is 58997613.

It is not a de Polignac number, because 31679985 - 2² = 31679981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31679981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89569 + ... + 89921.

It is an arithmetic number, because the mean of its divisors is an integer number (1648224).

Almost surely, 2^31679985 is an apocalyptic number.

It is an amenable number.

31679985 is a deficient number, since it is larger than the sum of its proper divisors (21063183).

31679985 is a wasteful number, since it uses less digits than its factorization.

31679985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585.

The product of its digits is 408240, while the sum is 48.

The square root of 31679985 is about 5628.4975792835. The cubic root of 31679985 is about 316.4183457988.

The spelling of 31679985 in words is "thirty-one million, six hundred seventy-nine thousand, nine hundred eighty-five".