31461985 has 12 divisors (see below), whose sum is σ = 40107708. Its totient is φ = 23687936.

The previous prime is 31461979. The next prime is 31462003. The reversal of 31461985 is 58916413.

It can be written as a sum of positive squares in 6 ways, for example, as 12321 + 31449664 = 111^2 + 5608^2 .

It is not a de Polignac number, because 31461985 - 2³ = 31461977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9442 + ... + 12331.

It is an arithmetic number, because the mean of its divisors is an integer number (3342309).

Almost surely, 2^31461985 is an apocalyptic number.

It is an amenable number.

31461985 is a deficient number, since it is larger than the sum of its proper divisors (8645723).

31461985 is a wasteful number, since it uses less digits than its factorization.

31461985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21812 (or 21795 counting only the distinct ones).

The product of its digits is 25920, while the sum is 37.

The square root of 31461985 is about 5609.0984124011. The cubic root of 31461985 is about 315.6908830216.

The spelling of 31461985 in words is "thirty-one million, four hundred sixty-one thousand, nine hundred eighty-five".