91944091 has 2 divisors, whose sum is σ = 91944092. Its totient is φ = 91944090.

The previous prime is 91944089. The next prime is 91944101. The reversal of 91944091 is 19044919.

It is a weak prime.

It is an emirp because it is prime and its reverse (19044919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91944091 - 2¹ = 91944089 is a prime.

Together with 91944089, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 91944091.

It is not a weakly prime, because it can be changed into another prime (91944991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45972045 + 45972046.

It is an arithmetic number, because the mean of its divisors is an integer number (45972046).

Almost surely, 2^91944091 is an apocalyptic number.

91944091 is a deficient number, since it is larger than the sum of its proper divisors (1).

91944091 is an equidigital number, since it uses as much as digits as its factorization.

91944091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 91944091 is about 9588.7481456132. The cubic root of 91944091 is about 451.3442782017.

The spelling of 91944091 in words is "ninety-one million, nine hundred forty-four thousand, ninety-one".