311229778693 has 2 divisors, whose sum is σ = 311229778694. Its totient is φ = 311229778692.

The previous prime is 311229778679. The next prime is 311229778723. The reversal of 311229778693 is 396877922113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 309811352449 + 1418426244 = 556607^2 + 37662^2 .

It is a cyclic number.

It is not a de Polignac number, because 311229778693 - 2¹⁷ = 311229647621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311229778603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155614889346 + 155614889347.

It is an arithmetic number, because the mean of its divisors is an integer number (155614889347).

Almost surely, 2^311229778693 is an apocalyptic number.

It is an amenable number.

311229778693 is a deficient number, since it is larger than the sum of its proper divisors (1).

311229778693 is an equidigital number, since it uses as much as digits as its factorization.

311229778693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 58.

The spelling of 311229778693 in words is "three hundred eleven billion, two hundred twenty-nine million, seven hundred seventy-eight thousand, six hundred ninety-three".