12161819 has 4 divisors (see below), whose sum is σ = 12444696. Its totient is φ = 11878944.

The previous prime is 12161801. The next prime is 12161833. The reversal of 12161819 is 91816121.

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 12161819 - 2⁸ = 12161563 is a prime.

It is a super-2 number, since 2×12161819² = 295819682777522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12161791 and 12161800.

It is not an unprimeable number, because it can be changed into a prime (12161839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141374 + ... + 141459.

It is an arithmetic number, because the mean of its divisors is an integer number (3111174).

Almost surely, 2^12161819 is an apocalyptic number.

12161819 is a deficient number, since it is larger than the sum of its proper divisors (282877).

12161819 is an equidigital number, since it uses as much as digits as its factorization.

12161819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282876.

The product of its digits is 864, while the sum is 29.

The square root of 12161819 is about 3487.3799620919. The cubic root of 12161819 is about 229.9673488622.

The spelling of 12161819 in words is "twelve million, one hundred sixty-one thousand, eight hundred nineteen".