11558 has 4 divisors (see below), whose sum is σ = 17340. Its totient is φ = 5778.

The previous prime is 11551. The next prime is 11579. The reversal of 11558 is 85511.

11558 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 an emirpimes, since its reverse is a distinct semiprime: 85511 = 233 ⋅367.

It is a magnanimous number.

It is a Curzon 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 (11551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2888 + ... + 2891.

It is an arithmetic number, because the mean of its divisors is an integer number (4335).

2¹¹⁵⁵⁸ is an apocalyptic number.

11558 is a deficient number, since it is larger than the sum of its proper divisors (5782).

11558 is an equidigital number, since it uses as much as digits as its factorization.

11558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5781.

The product of its digits is 200, while the sum is 20.

The square root of 11558 is about 107.5081392268. The cubic root of 11558 is about 22.6096703336.

It can be divided in two parts, 115 and 58, that multiplied together give a triangular number (6670 = T₁₁₅).

The spelling of 11558 in words is "eleven thousand, five hundred fifty-eight".