31310111111 has 4 divisors (see below), whose sum is σ = 31441116000. Its totient is φ = 31179106224.

The previous prime is 31310111101. The next prime is 31310111141. The reversal of 31310111111 is 11111101313.

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 31310111111 - 2¹⁸ = 31309848967 is a prime.

It is a Duffinian number.

31310111111 is a modest number, since divided by 111111 gives 31310 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31310111101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65502086 + ... + 65502563.

It is an arithmetic number, because the mean of its divisors is an integer number (7860279000).

Almost surely, 2^31310111111 is an apocalyptic number.

31310111111 is a deficient number, since it is larger than the sum of its proper divisors (131004889).

31310111111 is a wasteful number, since it uses less digits than its factorization.

31310111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131004888.

The product of its (nonzero) digits is 9, while the sum is 14.

Adding to 31310111111 its reverse (11111101313), we get a palindrome (42421212424).

The spelling of 31310111111 in words is "thirty-one billion, three hundred ten million, one hundred eleven thousand, one hundred eleven".