311496251321 has 2 divisors, whose sum is σ = 311496251322. Its totient is φ = 311496251320.

The previous prime is 311496251309. The next prime is 311496251323. The reversal of 311496251321 is 123152694113.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159580275625 + 151915975696 = 399475^2 + 389764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311496251321 is a prime.

Together with 311496251323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (311496251323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155748125660 + 155748125661.

It is an arithmetic number, because the mean of its divisors is an integer number (155748125661).

Almost surely, 2^311496251321 is an apocalyptic number.

It is an amenable number.

311496251321 is a deficient number, since it is larger than the sum of its proper divisors (1).

311496251321 is an equidigital number, since it uses as much as digits as its factorization.

311496251321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 38.

The spelling of 311496251321 in words is "three hundred eleven billion, four hundred ninety-six million, two hundred fifty-one thousand, three hundred twenty-one".