11567221 has 2 divisors, whose sum is σ = 11567222. Its totient is φ = 11567220.

The previous prime is 11567203. The next prime is 11567261. The reversal of 11567221 is 12276511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10595025 + 972196 = 3255^2 + 986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11567221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11567261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5783610 + 5783611.

It is an arithmetic number, because the mean of its divisors is an integer number (5783611).

Almost surely, 2^11567221 is an apocalyptic number.

It is an amenable number.

11567221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11567221 is an equidigital number, since it uses as much as digits as its factorization.

11567221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 25.

The square root of 11567221 is about 3401.0617459846. The cubic root of 11567221 is about 226.1568141832.

The spelling of 11567221 in words is "eleven million, five hundred sixty-seven thousand, two hundred twenty-one".