504729221 has 2 divisors, whose sum is σ = 504729222. Its totient is φ = 504729220.

The previous prime is 504729217. The next prime is 504729223. The reversal of 504729221 is 122927405.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256320100 + 248409121 = 16010^2 + 15761^2 .

It is a cyclic number.

It is not a de Polignac number, because 504729221 - 2² = 504729217 is a prime.

Together with 504729223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (504729223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252364610 + 252364611.

It is an arithmetic number, because the mean of its divisors is an integer number (252364611).

Almost surely, 2^504729221 is an apocalyptic number.

It is an amenable number.

504729221 is a deficient number, since it is larger than the sum of its proper divisors (1).

504729221 is an equidigital number, since it uses as much as digits as its factorization.

504729221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 504729221 is about 22466.1794927397. The cubic root of 504729221 is about 796.1950677412.

The spelling of 504729221 in words is "five hundred four million, seven hundred twenty-nine thousand, two hundred twenty-one".