91090079 has 2 divisors, whose sum is σ = 91090080. Its totient is φ = 91090078.

The previous prime is 91090049. The next prime is 91090099. The reversal of 91090079 is 97009019.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91090079 - 2²⁴ = 74312863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91090049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45545039 + 45545040.

It is an arithmetic number, because the mean of its divisors is an integer number (45545040).

Almost surely, 2^91090079 is an apocalyptic number.

91090079 is a deficient number, since it is larger than the sum of its proper divisors (1).

91090079 is an equidigital number, since it uses as much as digits as its factorization.

91090079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 91090079 is about 9544.1122688284. The cubic root of 91090079 is about 449.9425095280.

The spelling of 91090079 in words is "ninety-one million, ninety thousand, seventy-nine".