99193791 has 4 divisors (see below), whose sum is σ = 132258392. Its totient is φ = 66129192.

The previous prime is 99193789. The next prime is 99193799. The reversal of 99193791 is 19739199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19739199 = 3 ⋅6579733.

It is not a de Polignac number, because 99193791 - 2¹ = 99193789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99193791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99193799) 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, 16532296 + ... + 16532301.

It is an arithmetic number, because the mean of its divisors is an integer number (33064598).

Almost surely, 2^99193791 is an apocalyptic number.

99193791 is a deficient number, since it is larger than the sum of its proper divisors (33064601).

99193791 is a wasteful number, since it uses less digits than its factorization.

99193791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33064600.

The product of its digits is 137781, while the sum is 48.

The square root of 99193791 is about 9959.6079742126. The cubic root of 99193791 is about 462.9081525831.

The spelling of 99193791 in words is "ninety-nine million, one hundred ninety-three thousand, seven hundred ninety-one".