9991450497719 has 2 divisors, whose sum is σ = 9991450497720. Its totient is φ = 9991450497718.

The previous prime is 9991450497701. The next prime is 9991450497731. The reversal of 9991450497719 is 9177940541999.

9991450497719 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9991450497719 - 2²⁰ = 9991449449143 is a prime.

It is a super-2 number, since 2×9991450497719² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9991450496719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995725248859 + 4995725248860.

It is an arithmetic number, because the mean of its divisors is an integer number (4995725248860).

Almost surely, 2^{9991450497719} is an apocalyptic number.

9991450497719 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991450497719 is an equidigital number, since it uses as much as digits as its factorization.

9991450497719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 231472080, while the sum is 74.

The spelling of 9991450497719 in words is "nine trillion, nine hundred ninety-one billion, four hundred fifty million, four hundred ninety-seven thousand, seven hundred nineteen".