311993461520443 has 2 divisors, whose sum is σ = 311993461520444. Its totient is φ = 311993461520442.

The previous prime is 311993461520417. The next prime is 311993461520473. The reversal of 311993461520443 is 344025164399113.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311993461520443 is a prime.

It is not a weakly prime, because it can be changed into another prime (311993461520473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155996730760221 + 155996730760222.

It is an arithmetic number, because the mean of its divisors is an integer number (155996730760222).

Almost surely, 2^{311993461520443} is an apocalyptic number.

311993461520443 is a deficient number, since it is larger than the sum of its proper divisors (1).

311993461520443 is an equidigital number, since it uses as much as digits as its factorization.

311993461520443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8398080, while the sum is 55.

The spelling of 311993461520443 in words is "three hundred eleven trillion, nine hundred ninety-three billion, four hundred sixty-one million, five hundred twenty thousand, four hundred forty-three".