31311431111 has 4 divisors (see below), whose sum is σ = 31313249352. Its totient is φ = 31309612872.

The previous prime is 31311431059. The next prime is 31311431209. The reversal of 31311431111 is 11113411313.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31311431111 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 (31311431911) 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, 883040 + ... + 917813.

It is an arithmetic number, because the mean of its divisors is an integer number (7828312338).

Almost surely, 2^31311431111 is an apocalyptic number.

31311431111 is a deficient number, since it is larger than the sum of its proper divisors (1818241).

31311431111 is a wasteful number, since it uses less digits than its factorization.

31311431111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818240.

The product of its digits is 108, while the sum is 20.

Adding to 31311431111 its reverse (11113411313), we get a palindrome (42424842424).

The spelling of 31311431111 in words is "thirty-one billion, three hundred eleven million, four hundred thirty-one thousand, one hundred eleven".