31130312111 has 4 divisors (see below), whose sum is σ = 31136342112. Its totient is φ = 31124282112.

The previous prime is 31130312053. The next prime is 31130312123. The reversal of 31130312111 is 11121303113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31130312111 - 2¹⁴ = 31130295727 is a prime.

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 31130312111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31130312611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3007250 + ... + 3017583.

It is an arithmetic number, because the mean of its divisors is an integer number (7784085528).

Almost surely, 2^31130312111 is an apocalyptic number.

31130312111 is a deficient number, since it is larger than the sum of its proper divisors (6030001).

31130312111 is an equidigital number, since it uses as much as digits as its factorization.

31130312111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6030000.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 31130312111 its reverse (11121303113), we get a palindrome (42251615224).

The spelling of 31130312111 in words is "thirty-one billion, one hundred thirty million, three hundred twelve thousand, one hundred eleven".