31311121312111 has 4 divisors (see below), whose sum is σ = 32959075065400. Its totient is φ = 29663167558824.

The previous prime is 31311121312109. The next prime is 31311121312127. The reversal of 31311121312111 is 11121312111313.

It is a happy number.

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 31311121312111 - 2¹ = 31311121312109 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 (31311121312711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 823976876616 + ... + 823976876653.

It is an arithmetic number, because the mean of its divisors is an integer number (8239768766350).

Almost surely, 2^{31311121312111} is an apocalyptic number.

31311121312111 is a deficient number, since it is larger than the sum of its proper divisors (1647953753289).

31311121312111 is a wasteful number, since it uses less digits than its factorization.

31311121312111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1647953753288.

The product of its digits is 108, while the sum is 22.

Adding to 31311121312111 its reverse (11121312111313), we get a palindrome (42432433423424).

The spelling of 31311121312111 in words is "thirty-one trillion, three hundred eleven billion, one hundred twenty-one million, three hundred twelve thousand, one hundred eleven".