1820983613 has 4 divisors (see below), whose sum is σ = 1845928668. Its totient is φ = 1796038560.

The previous prime is 1820983597. The next prime is 1820983621. The reversal of 1820983613 is 3163890281.

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 1379899609 + 441084004 = 37147^2 + 21002^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820983613 - 2⁴ = 1820983597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820983643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12472418 + ... + 12472563.

It is an arithmetic number, because the mean of its divisors is an integer number (461482167).

Almost surely, 2^1820983613 is an apocalyptic number.

It is an amenable number.

1820983613 is a deficient number, since it is larger than the sum of its proper divisors (24945055).

1820983613 is an equidigital number, since it uses as much as digits as its factorization.

1820983613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24945054.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1820983613 is about 42672.9845804111. The cubic root of 1820983613 is about 1221.1490591798.

The spelling of 1820983613 in words is "one billion, eight hundred twenty million, nine hundred eighty-three thousand, six hundred thirteen".