647720453 has 2 divisors, whose sum is σ = 647720454. Its totient is φ = 647720452.

The previous prime is 647720429. The next prime is 647720471. The reversal of 647720453 is 354027746.

647720453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 613404289 + 34316164 = 24767^2 + 5858^2 .

It is a cyclic number.

It is not a de Polignac number, because 647720453 - 2¹⁴ = 647704069 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647740453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323860226 + 323860227.

It is an arithmetic number, because the mean of its divisors is an integer number (323860227).

Almost surely, 2^647720453 is an apocalyptic number.

It is an amenable number.

647720453 is a deficient number, since it is larger than the sum of its proper divisors (1).

647720453 is an equidigital number, since it uses as much as digits as its factorization.

647720453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 38.

The square root of 647720453 is about 25450.3527087544. The cubic root of 647720453 is about 865.2252870822.

The spelling of 647720453 in words is "six hundred forty-seven million, seven hundred twenty thousand, four hundred fifty-three".