31313221311 has 8 divisors (see below), whose sum is σ = 41756373760. Its totient is φ = 20872774872.

The previous prime is 31313221229. The next prime is 31313221319. The reversal of 31313221311 is 11312231313.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31313221311 - 2³¹ = 29165737663 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 (31313221319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 649345 + ... + 695898.

It is an arithmetic number, because the mean of its divisors is an integer number (5219546720).

Almost surely, 2^31313221311 is an apocalyptic number.

31313221311 is a deficient number, since it is larger than the sum of its proper divisors (10443152449).

31313221311 is a wasteful number, since it uses less digits than its factorization.

31313221311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353005.

The product of its digits is 324, while the sum is 21.

Adding to 31313221311 its reverse (11312231313), we get a palindrome (42625452624).

The spelling of 31313221311 in words is "thirty-one billion, three hundred thirteen million, two hundred twenty-one thousand, three hundred eleven".