31113112111 has 2 divisors, whose sum is σ = 31113112112. Its totient is φ = 31113112110.

The previous prime is 31113112073. The next prime is 31113112133. The reversal of 31113112111 is 11121131113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31113112111 - 2²¹ = 31111014959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31113112181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556556055 + 15556556056.

It is an arithmetic number, because the mean of its divisors is an integer number (15556556056).

Almost surely, 2^31113112111 is an apocalyptic number.

31113112111 is a deficient number, since it is larger than the sum of its proper divisors (1).

31113112111 is an equidigital number, since it uses as much as digits as its factorization.

31113112111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18, while the sum is 16.

Adding to 31113112111 its reverse (11121131113), we get a palindrome (42234243224).

The spelling of 31113112111 in words is "thirty-one billion, one hundred thirteen million, one hundred twelve thousand, one hundred eleven".