159837121 has 4 divisors (see below), whose sum is σ = 160187332. Its totient is φ = 159486912.

The previous prime is 159837109. The next prime is 159837127. The reversal of 159837121 is 121738951.

159837121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 144937521 + 14899600 = 12039^2 + 3860^2 .

It is a cyclic number.

It is not a de Polignac number, because 159837121 - 2⁵ = 159837089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159837127) 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, 174420 + ... + 175333.

It is an arithmetic number, because the mean of its divisors is an integer number (40046833).

Almost surely, 2^159837121 is an apocalyptic number.

It is an amenable number.

159837121 is a deficient number, since it is larger than the sum of its proper divisors (350211).

159837121 is an equidigital number, since it uses as much as digits as its factorization.

159837121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350210.

The product of its digits is 15120, while the sum is 37.

The square root of 159837121 is about 12642.6706434993. The cubic root of 159837121 is about 542.6992434283.

It can be divided in two parts, 15983 and 7121, that added together give a square (23104 = 152²).

The spelling of 159837121 in words is "one hundred fifty-nine million, eight hundred thirty-seven thousand, one hundred twenty-one".