648222649 has 2 divisors, whose sum is σ = 648222650. Its totient is φ = 648222648.

The previous prime is 648222643. The next prime is 648222671. The reversal of 648222649 is 946222846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 643535424 + 4687225 = 25368^2 + 2165^2 .

It is a cyclic number.

It is not a de Polignac number, because 648222649 - 2⁹ = 648222137 is a prime.

It is not a weakly prime, because it can be changed into another prime (648222643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324111324 + 324111325.

It is an arithmetic number, because the mean of its divisors is an integer number (324111325).

Almost surely, 2^648222649 is an apocalyptic number.

It is an amenable number.

648222649 is a deficient number, since it is larger than the sum of its proper divisors (1).

648222649 is an equidigital number, since it uses as much as digits as its factorization.

648222649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 43.

The square root of 648222649 is about 25460.2169865066. The cubic root of 648222649 is about 865.4488405344.

The spelling of 648222649 in words is "six hundred forty-eight million, two hundred twenty-two thousand, six hundred forty-nine".