11205811 has 4 divisors (see below), whose sum is σ = 11395800. Its totient is φ = 11015824.

The previous prime is 11205809. The next prime is 11205823. The reversal of 11205811 is 11850211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11850211 = 241 ⋅49171.

It is a cyclic number.

It is not a de Polignac number, because 11205811 - 2¹ = 11205809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11205841) 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, 94906 + ... + 95023.

It is an arithmetic number, because the mean of its divisors is an integer number (2848950).

Almost surely, 2^11205811 is an apocalyptic number.

11205811 is a deficient number, since it is larger than the sum of its proper divisors (189989).

11205811 is an equidigital number, since it uses as much as digits as its factorization.

11205811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189988.

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 11205811 is about 3347.5081777346. The cubic root of 11205811 is about 223.7764763775.

The spelling of 11205811 in words is "eleven million, two hundred five thousand, eight hundred eleven".