2225581 has 2 divisors, whose sum is σ = 2225582. Its totient is φ = 2225580.

The previous prime is 2225579. The next prime is 2225593. The reversal of 2225581 is 1855222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2223081 + 2500 = 1491^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 2225581 - 2¹ = 2225579 is a prime.

It is a super-2 number, since 2×2225581² = 9906421575122, which contains 22 as substring.

Together with 2225579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2225501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1112790 + 1112791.

It is an arithmetic number, because the mean of its divisors is an integer number (1112791).

2^2225581 is an apocalyptic number.

It is an amenable number.

2225581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2225581 is an equidigital number, since it uses as much as digits as its factorization.

2225581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1600, while the sum is 25.

The square root of 2225581 is about 1491.8381279482. The cubic root of 2225581 is about 130.5613007951.

The spelling of 2225581 in words is "two million, two hundred twenty-five thousand, five hundred eighty-one".