9991512087419 has 2 divisors, whose sum is σ = 9991512087420. Its totient is φ = 9991512087418.

The previous prime is 9991512087377. The next prime is 9991512087493. The reversal of 9991512087419 is 9147802151999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9991512087419 - 2⁸ = 9991512087163 is a prime.

It is a super-2 number, since 2×9991512087419² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9994512087419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995756043709 + 4995756043710.

It is an arithmetic number, because the mean of its divisors is an integer number (4995756043710).

Almost surely, 2^{9991512087419} is an apocalyptic number.

9991512087419 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991512087419 is an equidigital number, since it uses as much as digits as its factorization.

9991512087419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14696640, while the sum is 65.

The spelling of 9991512087419 in words is "nine trillion, nine hundred ninety-one billion, five hundred twelve million, eighty-seven thousand, four hundred nineteen".