91065589 has 2 divisors, whose sum is σ = 91065590. Its totient is φ = 91065588.

The previous prime is 91065587. The next prime is 91065593. The reversal of 91065589 is 98556019.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49463089 + 41602500 = 7033^2 + 6450^2 .

It is a cyclic number.

It is not a de Polignac number, because 91065589 - 2¹ = 91065587 is a prime.

Together with 91065587, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91065587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45532794 + 45532795.

It is an arithmetic number, because the mean of its divisors is an integer number (45532795).

Almost surely, 2^91065589 is an apocalyptic number.

It is an amenable number.

91065589 is a deficient number, since it is larger than the sum of its proper divisors (1).

91065589 is an equidigital number, since it uses as much as digits as its factorization.

91065589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 91065589 is about 9542.8291926451. The cubic root of 91065589 is about 449.9021828541.

The spelling of 91065589 in words is "ninety-one million, sixty-five thousand, five hundred eighty-nine".