55099 has 4 divisors (see below), whose sum is σ = 60120. Its totient is φ = 50080.

The previous prime is 55079. The next prime is 55103. The reversal of 55099 is 99055.

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 55099 - 2¹¹ = 53051 is a prime.

It is a Duffinian number.

55099 is a modest number, since divided by 99 gives 55 as remainder.

It is not an unprimeable number, because it can be changed into a prime (55009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2494 + ... + 2515.

It is an arithmetic number, because the mean of its divisors is an integer number (15030).

2⁵⁵⁰⁹⁹ is an apocalyptic number.

55099 is a deficient number, since it is larger than the sum of its proper divisors (5021).

55099 is a wasteful number, since it uses less digits than its factorization.

55099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5020.

The product of its (nonzero) digits is 2025, while the sum is 28.

The square root of 55099 is about 234.7317618048. The cubic root of 55099 is about 38.0523286454.

Subtracting 55099 from its reverse (99055), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 55099 in words is "fifty-five thousand, ninety-nine".