1808411209 has 4 divisors (see below), whose sum is σ = 1972812240. Its totient is φ = 1644010180.

The previous prime is 1808411177. The next prime is 1808411237. The reversal of 1808411209 is 9021148081.

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 1808411209 - 2⁵ = 1808411177 is a prime.

It is a super-2 number, since 2×1808411209² = 6540702201673683362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1808411239) 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, 82200499 + ... + 82200520.

It is an arithmetic number, because the mean of its divisors is an integer number (493203060).

Almost surely, 2^1808411209 is an apocalyptic number.

It is an amenable number.

1808411209 is a deficient number, since it is larger than the sum of its proper divisors (164401031).

1808411209 is a wasteful number, since it uses less digits than its factorization.

1808411209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164401030.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 1808411209 is about 42525.4183871247. The cubic root of 1808411209 is about 1218.3322210422.

The spelling of 1808411209 in words is "one billion, eight hundred eight million, four hundred eleven thousand, two hundred nine".