311311302131 has 2 divisors, whose sum is σ = 311311302132. Its totient is φ = 311311302130.

The previous prime is 311311302121. The next prime is 311311302151. The reversal of 311311302131 is 131203113113.

It is an a-pointer prime, because the next prime (311311302151) can be obtained adding 311311302131 to its sum of digits (20).

It is a weak prime.

It is an emirp because it is prime and its reverse (131203113113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311311302131 - 2²² = 311307107827 is a prime.

It is a super-2 number, since 2×311311302131² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (311311302101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155655651065 + 155655651066.

It is an arithmetic number, because the mean of its divisors is an integer number (155655651066).

Almost surely, 2^311311302131 is an apocalyptic number.

311311302131 is a deficient number, since it is larger than the sum of its proper divisors (1).

311311302131 is an equidigital number, since it uses as much as digits as its factorization.

311311302131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 20.

Adding to 311311302131 its reverse (131203113113), we get a palindrome (442514415244).

The spelling of 311311302131 in words is "three hundred eleven billion, three hundred eleven million, three hundred two thousand, one hundred thirty-one".