91599601 has 4 divisors (see below), whose sum is σ = 92628900. Its totient is φ = 90570304.

The previous prime is 91599581. The next prime is 91599619. The reversal of 91599601 is 10699519.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10699519 = 709 ⋅15091.

It can be written as a sum of positive squares in 2 ways, for example, as 11048976 + 80550625 = 3324^2 + 8975^2 .

It is a cyclic number.

It is not a de Polignac number, because 91599601 - 2⁹ = 91599089 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91599671) 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, 514516 + ... + 514693.

It is an arithmetic number, because the mean of its divisors is an integer number (23157225).

Almost surely, 2^91599601 is an apocalyptic number.

It is an amenable number.

91599601 is a deficient number, since it is larger than the sum of its proper divisors (1029299).

91599601 is a wasteful number, since it uses less digits than its factorization.

91599601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029298.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 91599601 is about 9570.7680465049. The cubic root of 91599601 is about 450.7798838359.

The spelling of 91599601 in words is "ninety-one million, five hundred ninety-nine thousand, six hundred one".