2195581 has 2 divisors, whose sum is σ = 2195582. Its totient is φ = 2195580.

The previous prime is 2195579. The next prime is 2195597. The reversal of 2195581 is 1855912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1779556 + 416025 = 1334^2 + 645^2 .

It is a cyclic number.

It is not a de Polignac number, because 2195581 - 2¹ = 2195579 is a prime.

It is a super-2 number, since 2×2195581² = 9641151855122, which contains 22 as substring.

Together with 2195579, 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 (2195521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097790 + 1097791.

It is an arithmetic number, because the mean of its divisors is an integer number (1097791).

2^2195581 is an apocalyptic number.

It is an amenable number.

2195581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2195581 is an equidigital number, since it uses as much as digits as its factorization.

2195581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 31.

The square root of 2195581 is about 1481.7493040322. The cubic root of 2195581 is about 129.9720058065.

The spelling of 2195581 in words is "two million, one hundred ninety-five thousand, five hundred eighty-one".