409046221 has 2 divisors, whose sum is σ = 409046222. Its totient is φ = 409046220.

The previous prime is 409046213. The next prime is 409046227. The reversal of 409046221 is 122640904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 404572996 + 4473225 = 20114^2 + 2115^2 .

It is a cyclic number.

It is not a de Polignac number, because 409046221 - 2³ = 409046213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 409046221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409046227) 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, 204523110 + 204523111.

It is an arithmetic number, because the mean of its divisors is an integer number (204523111).

Almost surely, 2^409046221 is an apocalyptic number.

It is an amenable number.

409046221 is a deficient number, since it is larger than the sum of its proper divisors (1).

409046221 is an equidigital number, since it uses as much as digits as its factorization.

409046221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 409046221 is about 20224.8911245524. The cubic root of 409046221 is about 742.3193730534.

The spelling of 409046221 in words is "four hundred nine million, forty-six thousand, two hundred twenty-one".