481664221 has 2 divisors, whose sum is σ = 481664222. Its totient is φ = 481664220.

The previous prime is 481664203. The next prime is 481664233. The reversal of 481664221 is 122466184.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 395452996 + 86211225 = 19886^2 + 9285^2 .

It is a cyclic number.

It is not a de Polignac number, because 481664221 - 2⁷ = 481664093 is a prime.

It is equal to p_25439614 and since 481664221 and 25439614 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (481664201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 240832110 + 240832111.

It is an arithmetic number, because the mean of its divisors is an integer number (240832111).

Almost surely, 2^481664221 is an apocalyptic number.

It is an amenable number.

481664221 is a deficient number, since it is larger than the sum of its proper divisors (1).

481664221 is an equidigital number, since it uses as much as digits as its factorization.

481664221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 34.

The square root of 481664221 is about 21946.8499106364. The cubic root of 481664221 is about 783.8773740295.

The spelling of 481664221 in words is "four hundred eighty-one million, six hundred sixty-four thousand, two hundred twenty-one".