31122211218 has 16 divisors (see below), whose sum is σ = 71136482880. Its totient is φ = 8892060336.

The previous prime is 31122211217. The next prime is 31122211247. The reversal of 31122211218 is 81211222113.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31122211217) by changing a digit.

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, 370502473 + ... + 370502556.

It is an arithmetic number, because the mean of its divisors is an integer number (4446030180).

Almost surely, 2^31122211218 is an apocalyptic number.

31122211218 is an abundant number, since it is smaller than the sum of its proper divisors (40014271662).

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

31122211218 is a wasteful number, since it uses less digits than its factorization.

31122211218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741005041.

The product of its digits is 384, while the sum is 24.

The spelling of 31122211218 in words is "thirty-one billion, one hundred twenty-two million, two hundred eleven thousand, two hundred eighteen".