31128986 has 8 divisors (see below), whose sum is σ = 53364000. Its totient is φ = 13340988.

The previous prime is 31128961. The next prime is 31128997. The reversal of 31128986 is 68982113.

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

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 1111736 + ... + 1111763.

It is an arithmetic number, because the mean of its divisors is an integer number (6670500).

Almost surely, 2^31128986 is an apocalyptic number.

31128986 is a deficient number, since it is larger than the sum of its proper divisors (22235014).

31128986 is a wasteful number, since it uses less digits than its factorization.

31128986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223508.

The product of its digits is 20736, while the sum is 38.

The square root of 31128986 is about 5579.3356235308. The cubic root of 31128986 is about 314.5731549572.

The spelling of 31128986 in words is "thirty-one million, one hundred twenty-eight thousand, nine hundred eighty-six".