11228181 has 4 divisors (see below), whose sum is σ = 14970912. Its totient is φ = 7485452.

The previous prime is 11228171. The next prime is 11228207. The reversal of 11228181 is 18182211.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18182211 = 3 ⋅6060737.

It is a cyclic number.

It is not a de Polignac number, because 11228181 - 2²² = 7033877 is a prime.

It is a super-2 number, since 2×11228181² = 252144097137522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11228171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1871361 + ... + 1871366.

It is an arithmetic number, because the mean of its divisors is an integer number (3742728).

Almost surely, 2^11228181 is an apocalyptic number.

It is an amenable number.

11228181 is a deficient number, since it is larger than the sum of its proper divisors (3742731).

11228181 is an equidigital number, since it uses as much as digits as its factorization.

11228181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3742730.

The product of its digits is 256, while the sum is 24.

The square root of 11228181 is about 3350.8478031686. The cubic root of 11228181 is about 223.9252846584.

The spelling of 11228181 in words is "eleven million, two hundred twenty-eight thousand, one hundred eighty-one".