648396977 has 2 divisors, whose sum is σ = 648396978. Its totient is φ = 648396976.

The previous prime is 648396971. The next prime is 648396997. The reversal of 648396977 is 779693846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 643180321 + 5216656 = 25361^2 + 2284^2 .

It is a cyclic number.

It is not a de Polignac number, because 648396977 - 2¹⁰ = 648395953 is a prime.

It is not a weakly prime, because it can be changed into another prime (648396971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324198488 + 324198489.

It is an arithmetic number, because the mean of its divisors is an integer number (324198489).

Almost surely, 2^648396977 is an apocalyptic number.

It is an amenable number.

648396977 is a deficient number, since it is larger than the sum of its proper divisors (1).

648396977 is an equidigital number, since it uses as much as digits as its factorization.

648396977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13716864, while the sum is 59.

The square root of 648396977 is about 25463.6402935637. The cubic root of 648396977 is about 865.5264159595.

The spelling of 648396977 in words is "six hundred forty-eight million, three hundred ninety-six thousand, nine hundred seventy-seven".