1808002111 has 4 divisors (see below), whose sum is σ = 1825903224. Its totient is φ = 1790101000.

The previous prime is 1808002081. The next prime is 1808002117. The reversal of 1808002111 is 1112008081.

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 1808002111 - 2⁹ = 1808001599 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808002117) 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, 8950405 + ... + 8950606.

It is an arithmetic number, because the mean of its divisors is an integer number (456475806).

Almost surely, 2^1808002111 is an apocalyptic number.

1808002111 is a deficient number, since it is larger than the sum of its proper divisors (17901113).

1808002111 is a wasteful number, since it uses less digits than its factorization.

1808002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17901112.

The product of its (nonzero) digits is 128, while the sum is 22.

The square root of 1808002111 is about 42520.6080742033. The cubic root of 1808002111 is about 1218.2403439181.

The spelling of 1808002111 in words is "one billion, eight hundred eight million, two thousand, one hundred eleven".