99822791 has 4 divisors (see below), whose sum is σ = 99998184. Its totient is φ = 99647400.

The previous prime is 99822787. The next prime is 99822799. The reversal of 99822791 is 19722899.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19722899 = 7 ⋅2817557.

It is a cyclic number.

It is not a de Polignac number, because 99822791 - 2² = 99822787 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 (99822799) 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, 86840 + ... + 87981.

It is an arithmetic number, because the mean of its divisors is an integer number (24999546).

Almost surely, 2^99822791 is an apocalyptic number.

99822791 is a deficient number, since it is larger than the sum of its proper divisors (175393).

99822791 is a wasteful number, since it uses less digits than its factorization.

99822791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175392.

The product of its digits is 163296, while the sum is 47.

The square root of 99822791 is about 9991.1356211394. The cubic root of 99822791 is about 463.8845441409.

The spelling of 99822791 in words is "ninety-nine million, eight hundred twenty-two thousand, seven hundred ninety-one".