91235791 has 2 divisors, whose sum is σ = 91235792. Its totient is φ = 91235790.

The previous prime is 91235773. The next prime is 91235801. The reversal of 91235791 is 19753219.

It is a strong prime.

It is an emirp because it is prime and its reverse (19753219) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91235791 - 2⁹ = 91235279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91235791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91235731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45617895 + 45617896.

It is an arithmetic number, because the mean of its divisors is an integer number (45617896).

Almost surely, 2^91235791 is an apocalyptic number.

91235791 is a deficient number, since it is larger than the sum of its proper divisors (1).

91235791 is an equidigital number, since it uses as much as digits as its factorization.

91235791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17010, while the sum is 37.

The square root of 91235791 is about 9551.7428252649. The cubic root of 91235791 is about 450.1822981562.

The spelling of 91235791 in words is "ninety-one million, two hundred thirty-five thousand, seven hundred ninety-one".