99922191 has 4 divisors (see below), whose sum is σ = 133229592. Its totient is φ = 66614792.

The previous prime is 99922187. The next prime is 99922219. The reversal of 99922191 is 19122999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99922191 - 2² = 99922187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99922391) 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, 16653696 + ... + 16653701.

It is an arithmetic number, because the mean of its divisors is an integer number (33307398).

Almost surely, 2^99922191 is an apocalyptic number.

99922191 is a deficient number, since it is larger than the sum of its proper divisors (33307401).

99922191 is a wasteful number, since it uses less digits than its factorization.

99922191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33307400.

The product of its digits is 26244, while the sum is 42.

The square root of 99922191 is about 9996.1087929254. The cubic root of 99922191 is about 464.0384663289.

The spelling of 99922191 in words is "ninety-nine million, nine hundred twenty-two thousand, one hundred ninety-one".