91101919291 has 2 divisors, whose sum is σ = 91101919292. Its totient is φ = 91101919290.

The previous prime is 91101919289. The next prime is 91101919303. The reversal of 91101919291 is 19291910119.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91101919291 - 2¹ = 91101919289 is a prime.

Together with 91101919289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91101919201) 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, 45550959645 + 45550959646.

It is an arithmetic number, because the mean of its divisors is an integer number (45550959646).

Almost surely, 2^91101919291 is an apocalyptic number.

91101919291 is a deficient number, since it is larger than the sum of its proper divisors (1).

91101919291 is an equidigital number, since it uses as much as digits as its factorization.

91101919291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 43.

The spelling of 91101919291 in words is "ninety-one billion, one hundred one million, nine hundred nineteen thousand, two hundred ninety-one".