1820219159 has 8 divisors (see below), whose sum is σ = 1987632000. Its totient is φ = 1653129400.

The previous prime is 1820219153. The next prime is 1820219161. The reversal of 1820219159 is 9519120281.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1820219159 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 (1820219153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68909 + ... + 91590.

It is an arithmetic number, because the mean of its divisors is an integer number (248454000).

Almost surely, 2^1820219159 is an apocalyptic number.

1820219159 is a deficient number, since it is larger than the sum of its proper divisors (167412841).

1820219159 is a wasteful number, since it uses less digits than its factorization.

1820219159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161541.

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 1820219159 is about 42664.0265211806. The cubic root of 1820219159 is about 1220.9781546684.

The spelling of 1820219159 in words is "one billion, eight hundred twenty million, two hundred nineteen thousand, one hundred fifty-nine".