11819 has 4 divisors (see below), whose sum is σ = 12096. Its totient is φ = 11544.

The previous prime is 11813. The next prime is 11821. The reversal of 11819 is 91811.

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 11819 - 2¹² = 7723 is a prime.

It is a super-2 number, since 2×11819² = 279377522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 11819.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11813) 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, 59 + ... + 164.

It is an arithmetic number, because the mean of its divisors is an integer number (3024).

2¹¹⁸¹⁹ is an apocalyptic number.

11819 is a deficient number, since it is larger than the sum of its proper divisors (277).

11819 is an equidigital number, since it uses as much as digits as its factorization.

11819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276.

The product of its digits is 72, while the sum is 20.

The square root of 11819 is about 108.7152243248. The cubic root of 11819 is about 22.7785938413.

It can be divided in two parts, 11 and 819, that multiplied together give a palindrome (9009).

The spelling of 11819 in words is "eleven thousand, eight hundred nineteen".