648842771 has 2 divisors, whose sum is σ = 648842772. Its totient is φ = 648842770.

The previous prime is 648842759. The next prime is 648842809. The reversal of 648842771 is 177248846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648842771 - 2⁶ = 648842707 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (648842731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324421385 + 324421386.

It is an arithmetic number, because the mean of its divisors is an integer number (324421386).

Almost surely, 2^648842771 is an apocalyptic number.

648842771 is a deficient number, since it is larger than the sum of its proper divisors (1).

648842771 is an equidigital number, since it uses as much as digits as its factorization.

648842771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 602112, while the sum is 47.

The square root of 648842771 is about 25472.3923297361. The cubic root of 648842771 is about 865.7247297000.

The spelling of 648842771 in words is "six hundred forty-eight million, eight hundred forty-two thousand, seven hundred seventy-one".