316127469821 has 2 divisors, whose sum is σ = 316127469822. Its totient is φ = 316127469820.

The previous prime is 316127469809. The next prime is 316127469829. The reversal of 316127469821 is 128964721613.

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., 312692337721 + 3435132100 = 559189^2 + 58610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-316127469821 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 316127469821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (316127469829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158063734910 + 158063734911.

It is an arithmetic number, because the mean of its divisors is an integer number (158063734911).

Almost surely, 2^316127469821 is an apocalyptic number.

It is an amenable number.

316127469821 is a deficient number, since it is larger than the sum of its proper divisors (1).

316127469821 is an equidigital number, since it uses as much as digits as its factorization.

316127469821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The spelling of 316127469821 in words is "three hundred sixteen billion, one hundred twenty-seven million, four hundred sixty-nine thousand, eight hundred twenty-one".