31312313111111 has 12 divisors (see below), whose sum is σ = 31914869875392. Its totient is φ = 30720926336256.

The previous prime is 31312313111083. The next prime is 31312313111113. The reversal of 31312313111111 is 11111131321313.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-31312313111111 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 (31312313111113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 255493130 + ... + 255615656.

It is an arithmetic number, because the mean of its divisors is an integer number (2659572489616).

Almost surely, 2^{31312313111111} is an apocalyptic number.

31312313111111 is a deficient number, since it is larger than the sum of its proper divisors (602556764281).

31312313111111 is an equidigital number, since it uses as much as digits as its factorization.

31312313111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213610 (or 213557 counting only the distinct ones).

The product of its digits is 162, while the sum is 23.

Adding to 31312313111111 its reverse (11111131321313), we get a palindrome (42423444432424).

The spelling of 31312313111111 in words is "thirty-one trillion, three hundred twelve billion, three hundred thirteen million, one hundred eleven thousand, one hundred eleven".