91946191 has 2 divisors, whose sum is σ = 91946192. Its totient is φ = 91946190.

The previous prime is 91946189. The next prime is 91946219. The reversal of 91946191 is 19164919.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91946191 - 2¹ = 91946189 is a prime.

Together with 91946189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91941191) by changing a digit.

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

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45973095 + 45973096.

It is an arithmetic number, because the mean of its divisors is an integer number (45973096).

Almost surely, 2^91946191 is an apocalyptic number.

91946191 is a deficient number, since it is larger than the sum of its proper divisors (1).

91946191 is an equidigital number, since it uses as much as digits as its factorization.

91946191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 40.

The square root of 91946191 is about 9588.8576483333. The cubic root of 91946191 is about 451.3477144050.

The spelling of 91946191 in words is "ninety-one million, nine hundred forty-six thousand, one hundred ninety-one".