647549803 has 2 divisors, whose sum is σ = 647549804. Its totient is φ = 647549802.

The previous prime is 647549801. The next prime is 647549821. The reversal of 647549803 is 308945746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647549803 - 2¹ = 647549801 is a prime.

Together with 647549801, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (647549801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323774901 + 323774902.

It is an arithmetic number, because the mean of its divisors is an integer number (323774902).

Almost surely, 2^647549803 is an apocalyptic number.

647549803 is a deficient number, since it is larger than the sum of its proper divisors (1).

647549803 is an equidigital number, since it uses as much as digits as its factorization.

647549803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 647549803 is about 25446.9998821079. Note that the first 3 decimals coincide. The cubic root of 647549803 is about 865.1492956246.

The spelling of 647549803 in words is "six hundred forty-seven million, five hundred forty-nine thousand, eight hundred three".