91599563 has 4 divisors (see below), whose sum is σ = 99926808. Its totient is φ = 83272320.

The previous prime is 91599559. The next prime is 91599577. The reversal of 91599563 is 36599519.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36599519 = 11 ⋅3327229.

It is a cyclic number.

It is not a de Polignac number, because 91599563 - 2² = 91599559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91599533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4163606 + ... + 4163627.

It is an arithmetic number, because the mean of its divisors is an integer number (24981702).

Almost surely, 2^91599563 is an apocalyptic number.

91599563 is a deficient number, since it is larger than the sum of its proper divisors (8327245).

91599563 is a wasteful number, since it uses less digits than its factorization.

91599563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8327244.

The product of its digits is 328050, while the sum is 47.

The square root of 91599563 is about 9570.7660612931. The cubic root of 91599563 is about 450.7798215007.

The spelling of 91599563 in words is "ninety-one million, five hundred ninety-nine thousand, five hundred sixty-three".