411581221 has 2 divisors, whose sum is σ = 411581222. Its totient is φ = 411581220.

The previous prime is 411581207. The next prime is 411581239. The reversal of 411581221 is 122185114.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 404452321 + 7128900 = 20111^2 + 2670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-411581221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (411581321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205790610 + 205790611.

It is an arithmetic number, because the mean of its divisors is an integer number (205790611).

Almost surely, 2^411581221 is an apocalyptic number.

It is an amenable number.

411581221 is a deficient number, since it is larger than the sum of its proper divisors (1).

411581221 is an equidigital number, since it uses as much as digits as its factorization.

411581221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 640, while the sum is 25.

The square root of 411581221 is about 20287.4646272027. The cubic root of 411581221 is about 743.8496855204.

The spelling of 411581221 in words is "four hundred eleven million, five hundred eighty-one thousand, two hundred twenty-one".