55851 has 4 divisors (see below), whose sum is σ = 74472. Its totient is φ = 37232.

The previous prime is 55849. The next prime is 55871. The reversal of 55851 is 15855.

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 55851 - 2¹ = 55849 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (55871) 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, 9306 + ... + 9311.

It is an arithmetic number, because the mean of its divisors is an integer number (18618).

2⁵⁵⁸⁵¹ is an apocalyptic number.

55851 is a deficient number, since it is larger than the sum of its proper divisors (18621).

55851 is a wasteful number, since it uses less digits than its factorization.

55851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18620.

The product of its digits is 1000, while the sum is 24.

The square root of 55851 is about 236.3281616736. The cubic root of 55851 is about 38.2246617611.

The spelling of 55851 in words is "fifty-five thousand, eight hundred fifty-one".