316721320247 has 2 divisors, whose sum is σ = 316721320248. Its totient is φ = 316721320246.

The previous prime is 316721320231. The next prime is 316721320259. The reversal of 316721320247 is 742023127613.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 316721320247 - 2⁴ = 316721320231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 316721320247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (316721320207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158360660123 + 158360660124.

It is an arithmetic number, because the mean of its divisors is an integer number (158360660124).

Almost surely, 2^316721320247 is an apocalyptic number.

316721320247 is a deficient number, since it is larger than the sum of its proper divisors (1).

316721320247 is an equidigital number, since it uses as much as digits as its factorization.

316721320247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 38.

The spelling of 316721320247 in words is "three hundred sixteen billion, seven hundred twenty-one million, three hundred twenty thousand, two hundred forty-seven".