2201581 has 2 divisors, whose sum is σ = 2201582. Its totient is φ = 2201580.

The previous prime is 2201543. The next prime is 2201597. The reversal of 2201581 is 1851022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2128681 + 72900 = 1459^2 + 270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2201581 is a prime.

It is a super-2 number, since 2×2201581² = 9693917799122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2201501) 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, 1100790 + 1100791.

It is an arithmetic number, because the mean of its divisors is an integer number (1100791).

2^2201581 is an apocalyptic number.

It is an amenable number.

2201581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2201581 is an equidigital number, since it uses as much as digits as its factorization.

2201581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 2201581 is about 1483.7725566946. The cubic root of 2201581 is about 130.0902923020.

The spelling of 2201581 in words is "two million, two hundred one thousand, five hundred eighty-one".