159409 has 4 divisors (see below), whose sum is σ = 168804. Its totient is φ = 150016.

The previous prime is 159407. The next prime is 159421. The reversal of 159409 is 904951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 904951 = 19 ⋅47629.

It can be written as a sum of positive squares in 2 ways, for example, as 67600 + 91809 = 260^2 + 303^2 .

It is a cyclic number.

It is not a de Polignac number, because 159409 - 2¹ = 159407 is a prime.

It is a super-2 number, since 2×159409² = 50822458562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159403) 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, 4672 + ... + 4705.

It is an arithmetic number, because the mean of its divisors is an integer number (42201).

2¹⁵⁹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

159409 is a deficient number, since it is larger than the sum of its proper divisors (9395).

159409 is an equidigital number, since it uses as much as digits as its factorization.

159409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9394.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 159409 is about 399.2605665477. The cubic root of 159409 is about 54.2214273289.

The spelling of 159409 in words is "one hundred fifty-nine thousand, four hundred nine".