447064721 has 2 divisors, whose sum is σ = 447064722. Its totient is φ = 447064720.

The previous prime is 447064687. The next prime is 447064753. The reversal of 447064721 is 127460744.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 268468225 + 178596496 = 16385^2 + 13364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-447064721 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (447064781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 223532360 + 223532361.

It is an arithmetic number, because the mean of its divisors is an integer number (223532361).

Almost surely, 2^447064721 is an apocalyptic number.

It is an amenable number.

447064721 is a deficient number, since it is larger than the sum of its proper divisors (1).

447064721 is an equidigital number, since it uses as much as digits as its factorization.

447064721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 35.

The square root of 447064721 is about 21143.9050555946. The cubic root of 447064721 is about 764.6396246425.

The spelling of 447064721 in words is "four hundred forty-seven million, sixty-four thousand, seven hundred twenty-one".