31112321311 has 4 divisors (see below), whose sum is σ = 31112898624. Its totient is φ = 31111744000.

The previous prime is 31112321309. The next prime is 31112321323. The reversal of 31112321311 is 11312321113.

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 31112321311 - 2¹ = 31112321309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112321371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198415 + ... + 318736.

It is an arithmetic number, because the mean of its divisors is an integer number (7778224656).

Almost surely, 2^31112321311 is an apocalyptic number.

31112321311 is a deficient number, since it is larger than the sum of its proper divisors (577313).

31112321311 is an equidigital number, since it uses as much as digits as its factorization.

31112321311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577312.

The product of its digits is 108, while the sum is 19.

Adding to 31112321311 its reverse (11312321113), we get a palindrome (42424642424).

The spelling of 31112321311 in words is "thirty-one billion, one hundred twelve million, three hundred twenty-one thousand, three hundred eleven".