311203213231 has 2 divisors, whose sum is σ = 311203213232. Its totient is φ = 311203213230.

The previous prime is 311203213229. The next prime is 311203213289. The reversal of 311203213231 is 132312302113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311203213231 - 2¹ = 311203213229 is a prime.

It is a super-2 number, since 2×311203213231² (a number of 24 digits) contains 22 as substring.

Together with 311203213229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311203213831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155601606615 + 155601606616.

It is an arithmetic number, because the mean of its divisors is an integer number (155601606616).

Almost surely, 2^311203213231 is an apocalyptic number.

311203213231 is a deficient number, since it is larger than the sum of its proper divisors (1).

311203213231 is an equidigital number, since it uses as much as digits as its factorization.

311203213231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 311203213231 its reverse (132312302113), we get a palindrome (443515515344).

The spelling of 311203213231 in words is "three hundred eleven billion, two hundred three million, two hundred thirteen thousand, two hundred thirty-one".