311323972481 has 2 divisors, whose sum is σ = 311323972482. Its totient is φ = 311323972480.

The previous prime is 311323972439. The next prime is 311323972489. The reversal of 311323972481 is 184279323113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161077809025 + 150246163456 = 401345^2 + 387616^2 .

It is a cyclic number.

It is not a de Polignac number, because 311323972481 - 2¹⁸ = 311323710337 is a prime.

It is a super-2 number, since 2×311323972481² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (311323972489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155661986240 + 155661986241.

It is an arithmetic number, because the mean of its divisors is an integer number (155661986241).

Almost surely, 2^311323972481 is an apocalyptic number.

It is an amenable number.

311323972481 is a deficient number, since it is larger than the sum of its proper divisors (1).

311323972481 is an equidigital number, since it uses as much as digits as its factorization.

311323972481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The spelling of 311323972481 in words is "three hundred eleven billion, three hundred twenty-three million, nine hundred seventy-two thousand, four hundred eighty-one".