316356511205621 has 2 divisors, whose sum is σ = 316356511205622. Its totient is φ = 316356511205620.

The previous prime is 316356511205611. The next prime is 316356511205659. The reversal of 316356511205621 is 126502115653613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306542319722500 + 9814191483121 = 17508350^2 + 3132761^2 .

It is a cyclic number.

It is not a de Polignac number, because 316356511205621 - 2⁴² = 311958464694517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (316356511205611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158178255602810 + 158178255602811.

It is an arithmetic number, because the mean of its divisors is an integer number (158178255602811).

Almost surely, 2^{316356511205621} is an apocalyptic number.

It is an amenable number.

316356511205621 is a deficient number, since it is larger than the sum of its proper divisors (1).

316356511205621 is an equidigital number, since it uses as much as digits as its factorization.

316356511205621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 316356511205621 in words is "three hundred sixteen trillion, three hundred fifty-six billion, five hundred eleven million, two hundred five thousand, six hundred twenty-one".