91759091 has 2 divisors, whose sum is σ = 91759092. Its totient is φ = 91759090.

The previous prime is 91759061. The next prime is 91759093. The reversal of 91759091 is 19095719.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (19095719) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91759091 - 2¹⁸ = 91496947 is a prime.

It is a super-2 number, since 2×91759091² = 16839461562292562, which contains 22 as substring.

Together with 91759093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91759093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45879545 + 45879546.

It is an arithmetic number, because the mean of its divisors is an integer number (45879546).

Almost surely, 2^91759091 is an apocalyptic number.

91759091 is a deficient number, since it is larger than the sum of its proper divisors (1).

91759091 is an equidigital number, since it uses as much as digits as its factorization.

91759091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25515, while the sum is 41.

The square root of 91759091 is about 9579.0965649168. The cubic root of 91759091 is about 451.0413594910.

The spelling of 91759091 in words is "ninety-one million, seven hundred fifty-nine thousand, ninety-one".