99188081 has 4 divisors (see below), whose sum is σ = 105022692. Its totient is φ = 93353472.

The previous prime is 99188077. The next prime is 99188087. The reversal of 99188081 is 18088199.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 77880625 + 21307456 = 8825^2 + 4616^2 .

It is a cyclic number.

It is not a de Polignac number, because 99188081 - 2² = 99188077 is a prime.

It is a super-2 number, since 2×99188081² = 19676550824925122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99188087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2917280 + ... + 2917313.

It is an arithmetic number, because the mean of its divisors is an integer number (26255673).

Almost surely, 2^99188081 is an apocalyptic number.

It is an amenable number.

99188081 is a deficient number, since it is larger than the sum of its proper divisors (5834611).

99188081 is a wasteful number, since it uses less digits than its factorization.

99188081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5834610.

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 99188081 is about 9959.3213122180. The cubic root of 99188081 is about 462.8992701176.

The spelling of 99188081 in words is "ninety-nine million, one hundred eighty-eight thousand, eighty-one".