91136191 has 2 divisors, whose sum is σ = 91136192. Its totient is φ = 91136190.

The previous prime is 91136173. The next prime is 91136207. The reversal of 91136191 is 19163119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91136191 - 2⁵ = 91136159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91136131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45568095 + 45568096.

It is an arithmetic number, because the mean of its divisors is an integer number (45568096).

Almost surely, 2^91136191 is an apocalyptic number.

91136191 is a deficient number, since it is larger than the sum of its proper divisors (1).

91136191 is an equidigital number, since it uses as much as digits as its factorization.

91136191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 31.

The square root of 91136191 is about 9546.5276933553. The cubic root of 91136191 is about 450.0184206451.

The spelling of 91136191 in words is "ninety-one million, one hundred thirty-six thousand, one hundred ninety-one".