5509999 has 4 divisors (see below), whose sum is σ = 6010920. Its totient is φ = 5009080.

The previous prime is 5509997. The next prime is 5510009. The reversal of 5509999 is 9999055.

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 5509999 - 2¹ = 5509997 is a prime.

It is a Duffinian number.

5509999 is a modest number, since divided by 9999 gives 550 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5509997) 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, 250444 + ... + 250465.

It is an arithmetic number, because the mean of its divisors is an integer number (1502730).

Almost surely, 2^5509999 is an apocalyptic number.

5509999 is a deficient number, since it is larger than the sum of its proper divisors (500921).

5509999 is a wasteful number, since it uses less digits than its factorization.

5509999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500920.

The product of its (nonzero) digits is 164025, while the sum is 46.

The square root of 5509999 is about 2347.3387058539. The cubic root of 5509999 is about 176.6243215627.

The spelling of 5509999 in words is "five million, five hundred nine thousand, nine hundred ninety-nine".