11573 has 4 divisors (see below), whose sum is σ = 11808. Its totient is φ = 11340.

The previous prime is 11551. The next prime is 11579. The reversal of 11573 is 37511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11573 - 2⁸ = 11317 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9 and base 15.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11579) 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, 11 + ... + 152.

It is an arithmetic number, because the mean of its divisors is an integer number (2952).

2¹¹⁵⁷³ is an apocalyptic number.

It is an amenable number.

11573 is a deficient number, since it is larger than the sum of its proper divisors (235).

11573 is an equidigital number, since it uses as much as digits as its factorization.

11573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234.

The product of its digits is 105, while the sum is 17.

The square root of 11573 is about 107.5778787670. The cubic root of 11573 is about 22.6194470668.

The spelling of 11573 in words is "eleven thousand, five hundred seventy-three".