99993609 has 20 divisors (see below), whose sum is σ = 158162004. Its totient is φ = 62740224.

The previous prime is 99993601. The next prime is 99993611. The reversal of 99993609 is 90639999.

It can be written as a sum of positive squares in 2 ways, for example, as 91011600 + 8982009 = 9540^2 + 2997^2 .

It is not a de Polignac number, because 99993609 - 2³ = 99993601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99993601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34932 + ... + 37685.

Almost surely, 2^99993609 is an apocalyptic number.

It is an amenable number.

99993609 is a deficient number, since it is larger than the sum of its proper divisors (58168395).

99993609 is a wasteful number, since it uses less digits than its factorization.

99993609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72646 (or 72637 counting only the distinct ones).

The product of its (nonzero) digits is 1062882, while the sum is 54.

The square root of 99993609 is about 9999.6804448942. The cubic root of 99993609 is about 464.1489950192.

The spelling of 99993609 in words is "ninety-nine million, nine hundred ninety-three thousand, six hundred nine".