31986135 has 36 divisors (see below), whose sum is σ = 56821752. Its totient is φ = 16641504.

The previous prime is 31986133. The next prime is 31986151. The reversal of 31986135 is 53168913.

It is a happy number.

31986135 is a `hidden beast` number, since 31 + 9 + 8 + 613 + 5 = 666.

It is not a de Polignac number, because 31986135 - 2¹ = 31986133 is a prime.

It is a super-2 number, since 2×31986135² = 2046225664476450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31986135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31986131) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 310494 + ... + 310596.

It is an arithmetic number, because the mean of its divisors is an integer number (1578382).

Almost surely, 2^31986135 is an apocalyptic number.

31986135 is a deficient number, since it is larger than the sum of its proper divisors (24835617).

31986135 is a wasteful number, since it uses less digits than its factorization.

31986135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 178 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 31986135 is about 5655.6286122764. The cubic root of 31986135 is about 317.4343510289.

The spelling of 31986135 in words is "thirty-one million, nine hundred eighty-six thousand, one hundred thirty-five".