1808181223 has 4 divisors (see below), whose sum is σ = 1808848960. Its totient is φ = 1807513488.

The previous prime is 1808181197. The next prime is 1808181241. The reversal of 1808181223 is 3221818081.

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 1808181223 - 2⁵ = 1808181191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808181253) 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, 329790 + ... + 335227.

It is an arithmetic number, because the mean of its divisors is an integer number (452212240).

Almost surely, 2^1808181223 is an apocalyptic number.

1808181223 is a deficient number, since it is larger than the sum of its proper divisors (667737).

1808181223 is an equidigital number, since it uses as much as digits as its factorization.

1808181223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667736.

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 1808181223 is about 42522.7142007657. The cubic root of 1808181223 is about 1218.2805714263.

The spelling of 1808181223 in words is "one billion, eight hundred eight million, one hundred eighty-one thousand, two hundred twenty-three".