159845821 has 4 divisors (see below), whose sum is σ = 159916444. Its totient is φ = 159775200.

The previous prime is 159845801. The next prime is 159845831. The reversal of 159845821 is 128548951.

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 64080025 + 95765796 = 8005^2 + 9786^2 .

It is a cyclic number.

It is not a de Polignac number, because 159845821 - 2¹⁷ = 159714749 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 (159845801) 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, 31800 + ... + 36481.

It is an arithmetic number, because the mean of its divisors is an integer number (39979111).

Almost surely, 2^159845821 is an apocalyptic number.

It is an amenable number.

159845821 is a deficient number, since it is larger than the sum of its proper divisors (70623).

159845821 is an equidigital number, since it uses as much as digits as its factorization.

159845821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70622.

The product of its digits is 115200, while the sum is 43.

The square root of 159845821 is about 12643.0147116896. The cubic root of 159845821 is about 542.7090896971.

The spelling of 159845821 in words is "one hundred fifty-nine million, eight hundred forty-five thousand, eight hundred twenty-one".