1816479289 has 4 divisors (see below), whose sum is σ = 1846257700. Its totient is φ = 1786700880.

The previous prime is 1816479283. The next prime is 1816479323. The reversal of 1816479289 is 9829746181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 942981264 + 873498025 = 30708^2 + 29555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1816479289 - 2¹⁵ = 1816446521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1816479283) 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, 14889114 + ... + 14889235.

It is an arithmetic number, because the mean of its divisors is an integer number (461564425).

Almost surely, 2^1816479289 is an apocalyptic number.

It is an amenable number.

1816479289 is a deficient number, since it is larger than the sum of its proper divisors (29778411).

1816479289 is an equidigital number, since it uses as much as digits as its factorization.

1816479289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29778410.

The product of its digits is 1741824, while the sum is 55.

The square root of 1816479289 is about 42620.1746711578. The cubic root of 1816479289 is about 1220.1413634008.

The spelling of 1816479289 in words is "one billion, eight hundred sixteen million, four hundred seventy-nine thousand, two hundred eighty-nine".