441957221 has 2 divisors, whose sum is σ = 441957222. Its totient is φ = 441957220.

The previous prime is 441957199. The next prime is 441957227. The reversal of 441957221 is 122759144.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 415588996 + 26368225 = 20386^2 + 5135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-441957221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (441957227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220978610 + 220978611.

It is an arithmetic number, because the mean of its divisors is an integer number (220978611).

Almost surely, 2^441957221 is an apocalyptic number.

It is an amenable number.

441957221 is a deficient number, since it is larger than the sum of its proper divisors (1).

441957221 is an equidigital number, since it uses as much as digits as its factorization.

441957221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 35.

The square root of 441957221 is about 21022.7786222469. The cubic root of 441957221 is about 761.7165844598.

The spelling of 441957221 in words is "four hundred forty-one million, nine hundred fifty-seven thousand, two hundred twenty-one".