316047187921 has 2 divisors, whose sum is σ = 316047187922. Its totient is φ = 316047187920.

The previous prime is 316047187903. The next prime is 316047187927. The reversal of 316047187921 is 129781740613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241498530625 + 74548657296 = 491425^2 + 273036^2 .

It is a cyclic number.

It is not a de Polignac number, because 316047187921 - 2⁹ = 316047187409 is a prime.

It is not a weakly prime, because it can be changed into another prime (316047187927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158023593960 + 158023593961.

It is an arithmetic number, because the mean of its divisors is an integer number (158023593961).

Almost surely, 2^316047187921 is an apocalyptic number.

It is an amenable number.

316047187921 is a deficient number, since it is larger than the sum of its proper divisors (1).

316047187921 is an equidigital number, since it uses as much as digits as its factorization.

316047187921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 316047187921 in words is "three hundred sixteen billion, forty-seven million, one hundred eighty-seven thousand, nine hundred twenty-one".