9191009099501 has 2 divisors, whose sum is σ = 9191009099502. Its totient is φ = 9191009099500.

The previous prime is 9191009099483. The next prime is 9191009099539. The reversal of 9191009099501 is 1059909001919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8170250473225 + 1020758626276 = 2858365^2 + 1010326^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9191009099501 is a prime.

It is a super-2 number, since 2×9191009099501² (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 (9191009099561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4595504549750 + 4595504549751.

It is an arithmetic number, because the mean of its divisors is an integer number (4595504549751).

Almost surely, 2^{9191009099501} is an apocalyptic number.

It is an amenable number.

9191009099501 is a deficient number, since it is larger than the sum of its proper divisors (1).

9191009099501 is an equidigital number, since it uses as much as digits as its factorization.

9191009099501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 295245, while the sum is 53.

The spelling of 9191009099501 in words is "nine trillion, one hundred ninety-one billion, nine million, ninety-nine thousand, five hundred one".