31311320111 has 4 divisors (see below), whose sum is σ = 31322057112. Its totient is φ = 31300583112.

The previous prime is 31311320101. The next prime is 31311320113. The reversal of 31311320111 is 11102311313.

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 31311320111 - 2¹⁰ = 31311319087 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 31311320111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311320113) 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, 5364125 + ... + 5369958.

It is an arithmetic number, because the mean of its divisors is an integer number (7830514278).

Almost surely, 2^31311320111 is an apocalyptic number.

31311320111 is a deficient number, since it is larger than the sum of its proper divisors (10737001).

31311320111 is a wasteful number, since it uses less digits than its factorization.

31311320111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10737000.

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

Adding to 31311320111 its reverse (11102311313), we get a palindrome (42413631424).

The spelling of 31311320111 in words is "thirty-one billion, three hundred eleven million, three hundred twenty thousand, one hundred eleven".