1819022109 has 4 divisors (see below), whose sum is σ = 2425362816. Its totient is φ = 1212681404.

The previous prime is 1819022089. The next prime is 1819022111. The reversal of 1819022109 is 9012209181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1819022109 - 2²⁰ = 1817973533 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1819022109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1819022119) 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, 303170349 + ... + 303170354.

It is an arithmetic number, because the mean of its divisors is an integer number (606340704).

Almost surely, 2^1819022109 is an apocalyptic number.

It is an amenable number.

1819022109 is a deficient number, since it is larger than the sum of its proper divisors (606340707).

1819022109 is an equidigital number, since it uses as much as digits as its factorization.

1819022109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606340706.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 1819022109 is about 42649.9954161779. The cubic root of 1819022109 is about 1220.7104410424.

The spelling of 1819022109 in words is "one billion, eight hundred nineteen million, twenty-two thousand, one hundred nine".