311320223231 has 2 divisors, whose sum is σ = 311320223232. Its totient is φ = 311320223230.

The previous prime is 311320223209. The next prime is 311320223243. The reversal of 311320223231 is 132322023113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311320223231 is a prime.

It is a super-2 number, since 2×311320223231² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 311320223197 and 311320223206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311320223131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155660111615 + 155660111616.

It is an arithmetic number, because the mean of its divisors is an integer number (155660111616).

Almost surely, 2^311320223231 is an apocalyptic number.

311320223231 is a deficient number, since it is larger than the sum of its proper divisors (1).

311320223231 is an equidigital number, since it uses as much as digits as its factorization.

311320223231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 311320223231 its reverse (132322023113), we get a palindrome (443642246344).

The spelling of 311320223231 in words is "three hundred eleven billion, three hundred twenty million, two hundred twenty-three thousand, two hundred thirty-one".