311201022131 has 2 divisors, whose sum is σ = 311201022132. Its totient is φ = 311201022130.

The previous prime is 311201022127. The next prime is 311201022149. The reversal of 311201022131 is 131220102113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311201022131 - 2² = 311201022127 is a prime.

It is a super-2 number, since 2×311201022131² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (311201012131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155600511065 + 155600511066.

It is an arithmetic number, because the mean of its divisors is an integer number (155600511066).

Almost surely, 2^311201022131 is an apocalyptic number.

311201022131 is a deficient number, since it is larger than the sum of its proper divisors (1).

311201022131 is an equidigital number, since it uses as much as digits as its factorization.

311201022131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 311201022131 its reverse (131220102113), we get a palindrome (442421124244).

The spelling of 311201022131 in words is "three hundred eleven billion, two hundred one million, twenty-two thousand, one hundred thirty-one".