647403697 has 2 divisors, whose sum is σ = 647403698. Its totient is φ = 647403696.

The previous prime is 647403683. The next prime is 647403751. The reversal of 647403697 is 796304746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 647397136 + 6561 = 25444^2 + 81^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647403697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (647403997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323701848 + 323701849.

It is an arithmetic number, because the mean of its divisors is an integer number (323701849).

Almost surely, 2^647403697 is an apocalyptic number.

It is an amenable number.

647403697 is a deficient number, since it is larger than the sum of its proper divisors (1).

647403697 is an equidigital number, since it uses as much as digits as its factorization.

647403697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 46.

The square root of 647403697 is about 25444.1289298730. The cubic root of 647403697 is about 865.0842231466.

The spelling of 647403697 in words is "six hundred forty-seven million, four hundred three thousand, six hundred ninety-seven".