704500721 has 2 divisors, whose sum is σ = 704500722. Its totient is φ = 704500720.

The previous prime is 704500711. The next prime is 704500729. The reversal of 704500721 is 127005407.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 613107121 + 91393600 = 24761^2 + 9560^2 .

It is an emirp because it is prime and its reverse (127005407) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-704500721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (704500729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352250360 + 352250361.

It is an arithmetic number, because the mean of its divisors is an integer number (352250361).

Almost surely, 2^704500721 is an apocalyptic number.

It is an amenable number.

704500721 is a deficient number, since it is larger than the sum of its proper divisors (1).

704500721 is an equidigital number, since it uses as much as digits as its factorization.

704500721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 704500721 is about 26542.4324620032. The cubic root of 704500721 is about 889.8028941111.

The spelling of 704500721 in words is "seven hundred four million, five hundred thousand, seven hundred twenty-one".