55819 has 2 divisors, whose sum is σ = 55820. Its totient is φ = 55818.

The previous prime is 55817. The next prime is 55823. The reversal of 55819 is 91855.

55819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55819 - 2¹ = 55817 is a prime.

It is a super-2 number, since 2×55819² = 6231521522, which contains 22 as substring.

Together with 55817, it forms a pair of twin primes.

It is an Ulam number.

55819 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (55813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27909 + 27910.

It is an arithmetic number, because the mean of its divisors is an integer number (27910).

2⁵⁵⁸¹⁹ is an apocalyptic number.

55819 is a deficient number, since it is larger than the sum of its proper divisors (1).

55819 is an equidigital number, since it uses as much as digits as its factorization.

55819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 28.

The square root of 55819 is about 236.2604495044. The cubic root of 55819 is about 38.2173600545.

The spelling of 55819 in words is "fifty-five thousand, eight hundred nineteen".