55801 has 4 divisors (see below), whose sum is σ = 57204.
Its totient is φ = 54400.
The previous prime is 55799. The next prime is 55807. The reversal of 55801 is 10855.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 5625 + 50176 = 75^2 + 224^2
It is a cyclic number.
It is not a de Polignac number, because 55801 - 21 = 55799 is a prime.
It is a super-2 number, since 2×558012 = 6227503202, which contains 22 as substring.
It is a Duffinian number.
55801 is a lucky number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (55807) 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, 640 + ... + 721.
It is an arithmetic number, because the mean of its divisors is an integer number (14301).
255801 is an apocalyptic number.
It is an amenable number.
55801 is a deficient number, since it is larger than the sum of its proper divisors (1403).
55801 is a wasteful number, since it uses less digits than its factorization.
55801 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1402.
The product of its (nonzero) digits is 200, while the sum is 19.
The square root of 55801 is about 236.2223528797.
Note that the first 3 decimals coincide.
The cubic root of 55801 is about 38.2132516180.
The spelling of 55801 in words is "fifty-five thousand, eight hundred one".