648319601 has 2 divisors, whose sum is σ = 648319602. Its totient is φ = 648319600.

The previous prime is 648319597. The next prime is 648319603. The reversal of 648319601 is 106913846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 515517025 + 132802576 = 22705^2 + 11524^2 .

It is a cyclic number.

It is not a de Polignac number, because 648319601 - 2² = 648319597 is a prime.

Together with 648319603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (648319603) 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, 324159800 + 324159801.

It is an arithmetic number, because the mean of its divisors is an integer number (324159801).

Almost surely, 2^648319601 is an apocalyptic number.

It is an amenable number.

648319601 is a deficient number, since it is larger than the sum of its proper divisors (1).

648319601 is an equidigital number, since it uses as much as digits as its factorization.

648319601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 648319601 is about 25462.1209053763. The cubic root of 648319601 is about 865.4919855933.

The spelling of 648319601 in words is "six hundred forty-eight million, three hundred nineteen thousand, six hundred one".