99802171 has 12 divisors (see below), whose sum is σ = 116951688. Its totient is φ = 84914592.

The previous prime is 99802147. The next prime is 99802177. The reversal of 99802171 is 17120899.

It is a de Polignac number, because none of the positive numbers 2^k-99802171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99802171.

It is not an unprimeable number, because it can be changed into a prime (99802177) 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 11 ways as a sum of consecutive naturals, for example, 721 + ... + 14146.

It is an arithmetic number, because the mean of its divisors is an integer number (9745974).

Almost surely, 2^99802171 is an apocalyptic number.

99802171 is a deficient number, since it is larger than the sum of its proper divisors (17149517).

99802171 is a wasteful number, since it uses less digits than its factorization.

99802171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15018 (or 15011 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 99802171 is about 9990.1036531159. The cubic root of 99802171 is about 463.8526010082.

The spelling of 99802171 in words is "ninety-nine million, eight hundred two thousand, one hundred seventy-one".