504513721 has 2 divisors, whose sum is σ = 504513722. Its totient is φ = 504513720.

The previous prime is 504513701. The next prime is 504513727. The reversal of 504513721 is 127315405.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 394578496 + 109935225 = 19864^2 + 10485^2 .

It is a cyclic number.

It is not a de Polignac number, because 504513721 - 2¹¹ = 504511673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 504513721.

It is not a weakly prime, because it can be changed into another prime (504513727) 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, 252256860 + 252256861.

It is an arithmetic number, because the mean of its divisors is an integer number (252256861).

Almost surely, 2^504513721 is an apocalyptic number.

It is an amenable number.

504513721 is a deficient number, since it is larger than the sum of its proper divisors (1).

504513721 is an equidigital number, since it uses as much as digits as its factorization.

504513721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 504513721 is about 22461.3828826277. The cubic root of 504513721 is about 796.0817367015.

The spelling of 504513721 in words is "five hundred four million, five hundred thirteen thousand, seven hundred twenty-one".