99532809 has 6 divisors (see below), whose sum is σ = 143769626. Its totient is φ = 66355200.

The previous prime is 99532801. The next prime is 99532817. The reversal of 99532809 is 90823599.

It is an interprime number because it is at equal distance from previous prime (99532801) and next prime (99532817).

It can be written as a sum of positive squares in only one way, i.e., 87609600 + 11923209 = 9360^2 + 3453^2 .

It is not a de Polignac number, because 99532809 - 2³ = 99532801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99532801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5529592 + ... + 5529609.

Almost surely, 2^99532809 is an apocalyptic number.

It is an amenable number.

99532809 is a deficient number, since it is larger than the sum of its proper divisors (44236817).

99532809 is a wasteful number, since it uses less digits than its factorization.

99532809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11059207 (or 11059204 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 99532809 is about 9976.6131026516. The cubic root of 99532809 is about 463.4349185790.

The spelling of 99532809 in words is "ninety-nine million, five hundred thirty-two thousand, eight hundred nine".