99078791 has 4 divisors (see below), whose sum is σ = 113232912. Its totient is φ = 84924672.

The previous prime is 99078769. The next prime is 99078797. The reversal of 99078791 is 19787099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19787099 = 17 ⋅1163947.

It is not a de Polignac number, because 99078791 - 2¹⁴ = 99062407 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 (99078797) 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, 7077050 + ... + 7077063.

It is an arithmetic number, because the mean of its divisors is an integer number (28308228).

Almost surely, 2^99078791 is an apocalyptic number.

99078791 is a deficient number, since it is larger than the sum of its proper divisors (14154121).

99078791 is a wasteful number, since it uses less digits than its factorization.

99078791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14154120.

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 99078791 is about 9953.8329803147. The cubic root of 99078791 is about 462.7291930512.

The spelling of 99078791 in words is "ninety-nine million, seventy-eight thousand, seven hundred ninety-one".