1809182013 has 4 divisors (see below), whose sum is σ = 2412242688. Its totient is φ = 1206121340.

The previous prime is 1809182009. The next prime is 1809182021. The reversal of 1809182013 is 3102819081.

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 1809182013 - 2² = 1809182009 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809182003) 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, 301530333 + ... + 301530338.

It is an arithmetic number, because the mean of its divisors is an integer number (603060672).

Almost surely, 2^1809182013 is an apocalyptic number.

It is an amenable number.

1809182013 is a deficient number, since it is larger than the sum of its proper divisors (603060675).

1809182013 is an equidigital number, since it uses as much as digits as its factorization.

1809182013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603060674.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1809182013 is about 42534.4802836475. The cubic root of 1809182013 is about 1218.5052941338.

The spelling of 1809182013 in words is "one billion, eight hundred nine million, one hundred eighty-two thousand, thirteen".