1813618489 has 4 divisors (see below), whose sum is σ = 1813708324. Its totient is φ = 1813528656.

The previous prime is 1813618483. The next prime is 1813618549. The reversal of 1813618489 is 9848163181.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9848163181 = 74771 ⋅131711.

It can be written as a sum of positive squares in 2 ways, for example, as 1302632464 + 510986025 = 36092^2 + 22605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1813618489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1813618483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1039 + ... + 60235.

It is an arithmetic number, because the mean of its divisors is an integer number (453427081).

Almost surely, 2^1813618489 is an apocalyptic number.

It is an amenable number.

1813618489 is a deficient number, since it is larger than the sum of its proper divisors (89835).

1813618489 is an equidigital number, since it uses as much as digits as its factorization.

1813618489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89834.

The product of its digits is 331776, while the sum is 49.

The square root of 1813618489 is about 42586.5998760173. The cubic root of 1813618489 is about 1219.5004873034.

The spelling of 1813618489 in words is "one billion, eight hundred thirteen million, six hundred eighteen thousand, four hundred eighty-nine".