159121 has 4 divisors (see below), whose sum is σ = 163044. Its totient is φ = 155200.

The previous prime is 159119. The next prime is 159157. The reversal of 159121 is 121951.

159121 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 46225 + 112896 = 215^2 + 336^2 .

It is a cyclic number.

It is not a de Polignac number, because 159121 - 2¹ = 159119 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159161) 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, 1900 + ... + 1981.

It is an arithmetic number, because the mean of its divisors is an integer number (40761).

2¹⁵⁹¹²¹ is an apocalyptic number.

It is an amenable number.

159121 is a deficient number, since it is larger than the sum of its proper divisors (3923).

159121 is an equidigital number, since it uses as much as digits as its factorization.

159121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3922.

The product of its digits is 90, while the sum is 19.

The square root of 159121 is about 398.8997367760. The cubic root of 159121 is about 54.1887541743.

It can be divided in two parts, 1591 and 21, that multiplied together give a triangular number (33411 = T₂₅₈).

The spelling of 159121 in words is "one hundred fifty-nine thousand, one hundred twenty-one".