31187106 has 24 divisors (see below), whose sum is σ = 70075824. Its totient is φ = 10395540.

The previous prime is 31187099. The next prime is 31187131. The reversal of 31187106 is 60178113.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 31187106.

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 11 ways as a sum of consecutive naturals, for example, 31600 + ... + 32571.

It is an arithmetic number, because the mean of its divisors is an integer number (2919826).

Almost surely, 2^31187106 is an apocalyptic number.

31187106 is an abundant number, since it is smaller than the sum of its proper divisors (38888718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31187106 is an equidigital number, since it uses as much as digits as its factorization.

31187106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64188 (or 64176 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 31187106 is about 5584.5417000861. The cubic root of 31187106 is about 314.7688099545.

The spelling of 31187106 in words is "thirty-one million, one hundred eighty-seven thousand, one hundred six".