647720543 has 2 divisors, whose sum is σ = 647720544. Its totient is φ = 647720542.

The previous prime is 647720533. The next prime is 647720639. The reversal of 647720543 is 345027746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647720543 - 2²² = 643526239 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 647720497 and 647720506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647720533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323860271 + 323860272.

It is an arithmetic number, because the mean of its divisors is an integer number (323860272).

Almost surely, 2^647720543 is an apocalyptic number.

647720543 is a deficient number, since it is larger than the sum of its proper divisors (1).

647720543 is an equidigital number, since it uses as much as digits as its factorization.

647720543 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 647720543 is about 25450.3544769027. The cubic root of 647720543 is about 865.2253271562.

The spelling of 647720543 in words is "six hundred forty-seven million, seven hundred twenty thousand, five hundred forty-three".