Year 2019 has some interesting properties (apart those listed below):

•
2019 is equal to the sum of all the perfect powers from 1
to 243=3^{5}.

•
2019 is the smallest number that can be written in 6 ways as the sum of the squares of 3 primes. For example, 2019 = 17^{2} + 19^{2} + 37^{2}.

• Together with is double (4038) and its triple (6057) it contains each digit at least once. The previous and next years with this property are 1920 and 2079, respectively.

2019 has 4 divisors (see below), whose sum is σ = 2696. Its totient is φ = 1344.

The previous prime is 2017. The next prime is 2027. The reversal of 2019 is 9102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2019 - 2^{1} = 2017 is a prime.

It is a super-2 number, since 2×2019^{2} = 8152722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

2019 is a lucky number.

It is a nialpdrome in base 14.

It is a zygodrome in base 2.

It is a junction number, because it is equal to *n*+sod(*n*) for *n* = 1995 and 2013.

It is not an unprimeable number, because it can be changed into a prime (2011) 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, 334 + ... + 339.

It is an arithmetic number, because the mean of its divisors is an integer number (674).

2^{2019} is an apocalyptic number.

2019 is a deficient number, since it is larger than the sum of its proper divisors (677).

2019 is an equidigital number, since it uses as much as digits as its factorization.

2019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 2019 is about 44.9332838773. The cubic root of 2019 is about 12.6389823194.

It can be divided in two parts, 201 and 9, that added together give a triangular number (210 = T_{20}).

The spelling of 2019 in words is "two thousand, nineteen".

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