31009986 has 32 divisors (see below), whose sum is σ = 78756480. Its totient is φ = 8859888.

The previous prime is 31009963. The next prime is 31009997. The reversal of 31009986 is 68990013.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31009986.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40641 + ... + 41396.

It is an arithmetic number, because the mean of its divisors is an integer number (2461140).

Almost surely, 2^31009986 is an apocalyptic number.

31009986 is an abundant number, since it is smaller than the sum of its proper divisors (47746494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31009986 is a wasteful number, since it uses less digits than its factorization.

31009986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82055 (or 82049 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 31009986 is about 5568.6610598958. The cubic root of 31009986 is about 314.1717926149.

Adding to 31009986 its reverse (68990013), we get a palindrome (99999999).

The spelling of 31009986 in words is "thirty-one million, nine thousand, nine hundred eighty-six".