91599559 has 2 divisors, whose sum is σ = 91599560. Its totient is φ = 91599558.

The previous prime is 91599539. The next prime is 91599577. The reversal of 91599559 is 95599519.

It is a strong prime.

It is an emirp because it is prime and its reverse (95599519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91599559 - 2⁵ = 91599527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91599539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45799779 + 45799780.

It is an arithmetic number, because the mean of its divisors is an integer number (45799780).

Almost surely, 2^91599559 is an apocalyptic number.

91599559 is a deficient number, since it is larger than the sum of its proper divisors (1).

91599559 is an equidigital number, since it uses as much as digits as its factorization.

91599559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 820125, while the sum is 52.

The square root of 91599559 is about 9570.7658523234. The cubic root of 91599559 is about 450.7798149391.

The spelling of 91599559 in words is "ninety-one million, five hundred ninety-nine thousand, five hundred fifty-nine".