19791750317 has 2 divisors, whose sum is σ = 19791750318. Its totient is φ = 19791750316.

The previous prime is 19791750301. The next prime is 19791750331. The reversal of 19791750317 is 71305719791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19708228996 + 83521321 = 140386^2 + 9139^2 .

It is an emirp because it is prime and its reverse (71305719791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19791750317 - 2⁴ = 19791750301 is a prime.

It is a super-2 number, since 2×19791750317² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19791750397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9895875158 + 9895875159.

It is an arithmetic number, because the mean of its divisors is an integer number (9895875159).

Almost surely, 2^19791750317 is an apocalyptic number.

It is an amenable number.

19791750317 is a deficient number, since it is larger than the sum of its proper divisors (1).

19791750317 is an equidigital number, since it uses as much as digits as its factorization.

19791750317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 416745, while the sum is 50.

The spelling of 19791750317 in words is "nineteen billion, seven hundred ninety-one million, seven hundred fifty thousand, three hundred seventeen".