2223581 has 2 divisors, whose sum is σ = 2223582. Its totient is φ = 2223580.

The previous prime is 2223563. The next prime is 2223587. The reversal of 2223581 is 1853222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2220100 + 3481 = 1490^2 + 59^2 .

It is a cyclic number.

It is not a de Polignac number, because 2223581 - 2¹⁴ = 2207197 is a prime.

It is a super-2 number, since 2×2223581² = 9888624927122, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2223587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1111790 + 1111791.

It is an arithmetic number, because the mean of its divisors is an integer number (1111791).

2^2223581 is an apocalyptic number.

It is an amenable number.

2223581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2223581 is an equidigital number, since it uses as much as digits as its factorization.

2223581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 23.

The square root of 2223581 is about 1491.1676632760. The cubic root of 2223581 is about 130.5221797956.

The spelling of 2223581 in words is "two million, two hundred twenty-three thousand, five hundred eighty-one".