123559 has 4 divisors (see below), whose sum is σ = 124504. Its totient is φ = 122616.

The previous prime is 123553. The next prime is 123581. The reversal of 123559 is 955321.

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: 955321 = 61 ⋅15661.

It is a cyclic number.

It is not a de Polignac number, because 123559 - 2³ = 123551 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123551) 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, 237 + ... + 550.

It is an arithmetic number, because the mean of its divisors is an integer number (31126).

2¹²³⁵⁵⁹ is an apocalyptic number.

123559 is a deficient number, since it is larger than the sum of its proper divisors (945).

123559 is an equidigital number, since it uses as much as digits as its factorization.

123559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944.

The product of its digits is 1350, while the sum is 25.

The square root of 123559 is about 351.5096015758. The cubic root of 123559 is about 49.8071235972.

The spelling of 123559 in words is "one hundred twenty-three thousand, five hundred fifty-nine".