9191011009231 has 2 divisors, whose sum is σ = 9191011009232. Its totient is φ = 9191011009230.

The previous prime is 9191011009129. The next prime is 9191011009253. The reversal of 9191011009231 is 1329001101919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9191011009231 - 2¹¹ = 9191011007183 is a prime.

It is a super-2 number, since 2×9191011009231² (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 (9191011003231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4595505504615 + 4595505504616.

It is an arithmetic number, because the mean of its divisors is an integer number (4595505504616).

Almost surely, 2^{9191011009231} is an apocalyptic number.

9191011009231 is a deficient number, since it is larger than the sum of its proper divisors (1).

9191011009231 is an equidigital number, since it uses as much as digits as its factorization.

9191011009231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 37.

The spelling of 9191011009231 in words is "nine trillion, one hundred ninety-one billion, eleven million, nine thousand, two hundred thirty-one".