804417721 has 2 divisors, whose sum is σ = 804417722. Its totient is φ = 804417720.

The previous prime is 804417707. The next prime is 804417739. The reversal of 804417721 is 127714408.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 746109225 + 58308496 = 27315^2 + 7636^2 .

It is a cyclic number.

It is not a de Polignac number, because 804417721 - 2¹⁵ = 804384953 is a prime.

It is not a weakly prime, because it can be changed into another prime (804417121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402208860 + 402208861.

It is an arithmetic number, because the mean of its divisors is an integer number (402208861).

Almost surely, 2^804417721 is an apocalyptic number.

It is an amenable number.

804417721 is a deficient number, since it is larger than the sum of its proper divisors (1).

804417721 is an equidigital number, since it uses as much as digits as its factorization.

804417721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 804417721 is about 28362.2587429140. The cubic root of 804417721 is about 930.0234013459.

The spelling of 804417721 in words is "eight hundred four million, four hundred seventeen thousand, seven hundred twenty-one".