155959 has 4 divisors (see below), whose sum is σ = 156816. Its totient is φ = 155104.

The previous prime is 155921. The next prime is 156007. The reversal of 155959 is 959551.

155959 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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 959551 = 577 ⋅1663.

It is a cyclic number.

It is not a de Polignac number, because 155959 - 2¹¹ = 153911 is a prime.

It is a Duffinian number.

155959 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (150959) 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, 34 + ... + 559.

It is an arithmetic number, because the mean of its divisors is an integer number (39204).

2¹⁵⁵⁹⁵⁹ is an apocalyptic number.

155959 is a deficient number, since it is larger than the sum of its proper divisors (857).

155959 is an equidigital number, since it uses as much as digits as its factorization.

155959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856.

The product of its digits is 10125, while the sum is 34.

The square root of 155959 is about 394.9164468593. The cubic root of 155959 is about 53.8274096453.

The spelling of 155959 in words is "one hundred fifty-five thousand, nine hundred fifty-nine".