647440543 has 2 divisors, whose sum is σ = 647440544. Its totient is φ = 647440542.

The previous prime is 647440537. The next prime is 647440567. The reversal of 647440543 is 345044746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647440543 - 2⁵ = 647440511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647440243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323720271 + 323720272.

It is an arithmetic number, because the mean of its divisors is an integer number (323720272).

Almost surely, 2^647440543 is an apocalyptic number.

647440543 is a deficient number, since it is larger than the sum of its proper divisors (1).

647440543 is an equidigital number, since it uses as much as digits as its factorization.

647440543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 37.

The square root of 647440543 is about 25444.8529765845. The cubic root of 647440543 is about 865.1006344877.

The spelling of 647440543 in words is "six hundred forty-seven million, four hundred forty thousand, five hundred forty-three".