31310321111 has 4 divisors (see below), whose sum is σ = 31310716824. Its totient is φ = 31309925400.

The previous prime is 31310321101. The next prime is 31310321123. The reversal of 31310321111 is 11112301313.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 11112301313 = 743 ⋅14955991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31310321111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31310321111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31310321101) 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, 33860 + ... + 252521.

It is an arithmetic number, because the mean of its divisors is an integer number (7827679206).

Almost surely, 2^31310321111 is an apocalyptic number.

31310321111 is a deficient number, since it is larger than the sum of its proper divisors (395713).

31310321111 is a wasteful number, since it uses less digits than its factorization.

31310321111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395712.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 31310321111 its reverse (11112301313), we get a palindrome (42422622424).

The spelling of 31310321111 in words is "thirty-one billion, three hundred ten million, three hundred twenty-one thousand, one hundred eleven".