159 has 4 divisors (see below), whose sum is σ = 216. Its totient is φ = 104.

The previous prime is 157. The next prime is 163. The reversal of 159 is 951.

Subtracting from 159 its sum of digits (15), we obtain a square (144 = 12^{2}).

159 is an esthetic number in base 15, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 951 = 3 ⋅317.

It is a cyclic number.

It is not a de Polignac number, because 159 - 2^{1} = 157 is a prime.

It is a D-number.

159 is a lucky number.

It is a straight-line number, since its digits are in arithmetic progression.

It is a plaindrome in base 5, base 8, base 10, base 11, base 12 and base 16.

It is a nialpdrome in base 13, base 14 and base 15.

It is a congruent number.

Being equal to 5×2^{5}-1, it is a Woodall number.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24 + ... + 29.

It is an arithmetic number, because the mean of its divisors is an integer number (54).

159 is a deficient number, since it is larger than the sum of its proper divisors (57).

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

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

The sum of its prime factors is 56.

The product of its digits is 45, while the sum is 15.

The square root of 159 is about 12.6095202129. The cubic root of 159 is about 5.4175015150.

The spelling of 159 in words is "one hundred fifty-nine", and thus it is an aban number.

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