31112320211 has 16 divisors (see below), whose sum is σ = 37653972480. Its totient is φ = 25095381120.

The previous prime is 31112320181. The next prime is 31112320229. The reversal of 31112320211 is 11202321113.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31112320211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31112320211.

It is not an unprimeable number, because it can be changed into a prime (31112320231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1067450 + ... + 1096208.

It is an arithmetic number, because the mean of its divisors is an integer number (2353373280).

Almost surely, 2^31112320211 is an apocalyptic number.

31112320211 is a deficient number, since it is larger than the sum of its proper divisors (6541652269).

31112320211 is a wasteful number, since it uses less digits than its factorization.

31112320211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37874.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31112320211 its reverse (11202321113), we get a palindrome (42314641324).

The spelling of 31112320211 in words is "thirty-one billion, one hundred twelve million, three hundred twenty thousand, two hundred eleven".