31981154 has 16 divisors (see below), whose sum is σ = 49558392. Its totient is φ = 15470208.

The previous prime is 31981133. The next prime is 31981193. The reversal of 31981154 is 45118913.

It can be written as a sum of positive squares in 4 ways, for example, as 31528225 + 452929 = 5615^2 + 673^2 .

It is a super-3 number, since 3×31981154³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 31981154.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5672 + ... + 9804.

Almost surely, 2^31981154 is an apocalyptic number.

31981154 is a deficient number, since it is larger than the sum of its proper divisors (17577238).

31981154 is a wasteful number, since it uses less digits than its factorization.

31981154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4261.

The product of its digits is 4320, while the sum is 32.

The square root of 31981154 is about 5655.1882373622. The cubic root of 31981154 is about 317.4178728206.

The spelling of 31981154 in words is "thirty-one million, nine hundred eighty-one thousand, one hundred fifty-four".