31996618 has 16 divisors (see below), whose sum is σ = 50923080. Its totient is φ = 15026176.

The previous prime is 31996609. The next prime is 31996663. The reversal of 31996618 is 81669913.

It can be written as a sum of positive squares in 4 ways, for example, as 11175649 + 20820969 = 3343^2 + 4563^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31080 + ... + 32092.

Almost surely, 2^31996618 is an apocalyptic number.

31996618 is a deficient number, since it is larger than the sum of its proper divisors (18926462).

31996618 is a wasteful number, since it uses less digits than its factorization.

31996618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961.

The product of its digits is 69984, while the sum is 43.

The square root of 31996618 is about 5656.5553122019. Note that the first 3 decimals coincide. The cubic root of 31996618 is about 317.4690254363.

The spelling of 31996618 in words is "thirty-one million, nine hundred ninety-six thousand, six hundred eighteen".