311122220231 has 2 divisors, whose sum is σ = 311122220232. Its totient is φ = 311122220230.

The previous prime is 311122220191. The next prime is 311122220237. The reversal of 311122220231 is 132022221113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 311122220231 - 2³⁰ = 310048478407 is a prime.

It is a super-2 number, since 2×311122220231² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311122220237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155561110115 + 155561110116.

It is an arithmetic number, because the mean of its divisors is an integer number (155561110116).

Almost surely, 2^311122220231 is an apocalyptic number.

311122220231 is a deficient number, since it is larger than the sum of its proper divisors (1).

311122220231 is an equidigital number, since it uses as much as digits as its factorization.

311122220231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 311122220231 its reverse (132022221113), we get a palindrome (443144441344).

The spelling of 311122220231 in words is "three hundred eleven billion, one hundred twenty-two million, two hundred twenty thousand, two hundred thirty-one".