91174891 has 2 divisors, whose sum is σ = 91174892. Its totient is φ = 91174890.

The previous prime is 91174849. The next prime is 91174933. The reversal of 91174891 is 19847119.

It is a balanced prime because it is at equal distance from previous prime (91174849) and next prime (91174933).

It is a cyclic number.

It is not a de Polignac number, because 91174891 - 2¹¹ = 91172843 is a prime.

It is not a weakly prime, because it can be changed into another prime (91174801) 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, 45587445 + 45587446.

It is an arithmetic number, because the mean of its divisors is an integer number (45587446).

Almost surely, 2^91174891 is an apocalyptic number.

91174891 is a deficient number, since it is larger than the sum of its proper divisors (1).

91174891 is an equidigital number, since it uses as much as digits as its factorization.

91174891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 40.

The square root of 91174891 is about 9548.5543932053. The cubic root of 91174891 is about 450.0821101196.

The spelling of 91174891 in words is "ninety-one million, one hundred seventy-four thousand, eight hundred ninety-one".