99809817 has 8 divisors (see below), whose sum is σ = 134096160. Its totient is φ = 66031680.

The previous prime is 99809813. The next prime is 99809861. The reversal of 99809817 is 71890899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99809817 - 2² = 99809813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99809817.

It is not an unprimeable number, because it can be changed into a prime (99809813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126592 + ... + 127377.

It is an arithmetic number, because the mean of its divisors is an integer number (16762020).

Almost surely, 2^99809817 is an apocalyptic number.

It is an amenable number.

99809817 is a deficient number, since it is larger than the sum of its proper divisors (34286343).

99809817 is a wasteful number, since it uses less digits than its factorization.

99809817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254103.

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 99809817 is about 9990.4863244989. The cubic root of 99809817 is about 463.8644461961.

The spelling of 99809817 in words is "ninety-nine million, eight hundred nine thousand, eight hundred seventeen".