99791599 has 4 divisors (see below), whose sum is σ = 100110736. Its totient is φ = 99472464.

The previous prime is 99791569. The next prime is 99791611. The reversal of 99791599 is 99519799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99519799 = 2909 ⋅34211.

It is a cyclic number.

It is not a de Polignac number, because 99791599 - 2¹⁵ = 99758831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99791539) 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, 159099 + ... + 159724.

It is an arithmetic number, because the mean of its divisors is an integer number (25027684).

Almost surely, 2^99791599 is an apocalyptic number.

99791599 is a deficient number, since it is larger than the sum of its proper divisors (319137).

99791599 is a wasteful number, since it uses less digits than its factorization.

99791599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319136.

The product of its digits is 2066715, while the sum is 58.

The square root of 99791599 is about 9989.5745154636. The cubic root of 99791599 is about 463.8362218626.

The spelling of 99791599 in words is "ninety-nine million, seven hundred ninety-one thousand, five hundred ninety-nine".