647534401 has 2 divisors, whose sum is σ = 647534402. Its totient is φ = 647534400.

The previous prime is 647534389. The next prime is 647534423. The reversal of 647534401 is 104435746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 510082225 + 137452176 = 22585^2 + 11724^2 .

It is a cyclic number.

It is not a de Polignac number, because 647534401 - 2⁷ = 647534273 is a prime.

It is not a weakly prime, because it can be changed into another prime (647534491) 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, 323767200 + 323767201.

It is an arithmetic number, because the mean of its divisors is an integer number (323767201).

Almost surely, 2^647534401 is an apocalyptic number.

It is an amenable number.

647534401 is a deficient number, since it is larger than the sum of its proper divisors (1).

647534401 is an equidigital number, since it uses as much as digits as its factorization.

647534401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 647534401 is about 25446.6972513134. The cubic root of 647534401 is about 865.1424363658.

The spelling of 647534401 in words is "six hundred forty-seven million, five hundred thirty-four thousand, four hundred one".