311320202981 has 2 divisors, whose sum is σ = 311320202982. Its totient is φ = 311320202980.

The previous prime is 311320202971. The next prime is 311320203041. The reversal of 311320202981 is 189202023113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198586096900 + 112734106081 = 445630^2 + 335759^2 .

It is an emirp because it is prime and its reverse (189202023113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311320202981 is a prime.

It is a super-2 number, since 2×311320202981² (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 (311320202911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155660101490 + 155660101491.

It is an arithmetic number, because the mean of its divisors is an integer number (155660101491).

Almost surely, 2^311320202981 is an apocalyptic number.

It is an amenable number.

311320202981 is a deficient number, since it is larger than the sum of its proper divisors (1).

311320202981 is an equidigital number, since it uses as much as digits as its factorization.

311320202981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 311320202981 in words is "three hundred eleven billion, three hundred twenty million, two hundred two thousand, nine hundred eighty-one".