647064449 has 2 divisors, whose sum is σ = 647064450. Its totient is φ = 647064448.

The previous prime is 647064409. The next prime is 647064469. The reversal of 647064449 is 944460746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 574081600 + 72982849 = 23960^2 + 8543^2 .

It is a cyclic number.

It is not a de Polignac number, because 647064449 - 2¹² = 647060353 is a prime.

It is not a weakly prime, because it can be changed into another prime (647064409) 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, 323532224 + 323532225.

It is an arithmetic number, because the mean of its divisors is an integer number (323532225).

Almost surely, 2^647064449 is an apocalyptic number.

It is an amenable number.

647064449 is a deficient number, since it is larger than the sum of its proper divisors (1).

647064449 is an equidigital number, since it uses as much as digits as its factorization.

647064449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 44.

The square root of 647064449 is about 25437.4615282264. The cubic root of 647064449 is about 864.9330915982.

The spelling of 647064449 in words is "six hundred forty-seven million, sixty-four thousand, four hundred forty-nine".