55199 has 6 divisors (see below), whose sum is σ = 58944. Its totient is φ = 51680.

The previous prime is 55171. The next prime is 55201. The reversal of 55199 is 99155.

It is a de Polignac number, because none of the positive numbers 2^k-55199 is a prime.

It is a Duffinian number.

Its product of digits (2025) is a multiple of the sum of its prime factors (225).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55109) 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, 194 + ... + 384.

It is an arithmetic number, because the mean of its divisors is an integer number (9824).

2⁵⁵¹⁹⁹ is an apocalyptic number.

55199 is a deficient number, since it is larger than the sum of its proper divisors (3745).

55199 is a wasteful number, since it uses less digits than its factorization.

55199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 208 counting only the distinct ones).

The product of its digits is 2025, while the sum is 29.

The square root of 55199 is about 234.9446743384. The cubic root of 55199 is about 38.0753353130.

Subtracting 55199 from its reverse (99155), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 55199 in words is "fifty-five thousand, one hundred ninety-nine".