31690885 has 8 divisors (see below), whose sum is σ = 38065176. Its totient is φ = 25328640.

The previous prime is 31690861. The next prime is 31690889. The reversal of 31690885 is 58809613.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 173889 + 31516996 = 417^2 + 5614^2 .

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

It is not a de Polignac number, because 31690885 - 2¹⁷ = 31559813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31690889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4477 + ... + 9133.

It is an arithmetic number, because the mean of its divisors is an integer number (4758147).

Almost surely, 2^31690885 is an apocalyptic number.

It is an amenable number.

31690885 is a deficient number, since it is larger than the sum of its proper divisors (6374291).

31690885 is a wasteful number, since it uses less digits than its factorization.

31690885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6023.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 31690885 is about 5629.4657828252. The cubic root of 31690885 is about 316.4546312168.

The spelling of 31690885 in words is "thirty-one million, six hundred ninety thousand, eight hundred eighty-five".