99995599 has 4 divisors (see below), whose sum is σ = 109086120. Its totient is φ = 90905080.

The previous prime is 99995591. The next prime is 99995603. The reversal of 99995599 is 99559999.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 99995599 - 2³ = 99995591 is a prime.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99995599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99995591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4545244 + ... + 4545265.

It is an arithmetic number, because the mean of its divisors is an integer number (27271530).

Almost surely, 2^99995599 is an apocalyptic number.

99995599 is a deficient number, since it is larger than the sum of its proper divisors (9090521).

99995599 is a wasteful number, since it uses less digits than its factorization.

99995599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9090520.

The product of its digits is 13286025, while the sum is 64.

The square root of 99995599 is about 9999.7799475788. The cubic root of 99995599 is about 464.1520740506.

Subtracting from 99995599 its reverse (99559999), we obtain a square (435600 = 660²).

The spelling of 99995599 in words is "ninety-nine million, nine hundred ninety-five thousand, five hundred ninety-nine".