9999962187991 has 2 divisors, whose sum is σ = 9999962187992. Its totient is φ = 9999962187990.

The previous prime is 9999962187967. The next prime is 9999962188159. The reversal of 9999962187991 is 1997812699999.

It is a weak prime.

It is an emirp because it is prime and its reverse (1997812699999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9999962187991 is a prime.

It is a super-2 number, since 2×9999962187991² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999962187091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999981093995 + 4999981093996.

It is an arithmetic number, because the mean of its divisors is an integer number (4999981093996).

Almost surely, 2^{9999962187991} is an apocalyptic number.

9999962187991 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999962187991 is an equidigital number, since it uses as much as digits as its factorization.

9999962187991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3214155168, while the sum is 88.

The spelling of 9999962187991 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred sixty-two million, one hundred eighty-seven thousand, nine hundred ninety-one".