648378041 has 2 divisors, whose sum is σ = 648378042. Its totient is φ = 648378040.

The previous prime is 648378007. The next prime is 648378061. The reversal of 648378041 is 140873846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 484000000 + 164378041 = 22000^2 + 12821^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648378041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 648378041.

It is not a weakly prime, because it can be changed into another prime (648378061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324189020 + 324189021.

It is an arithmetic number, because the mean of its divisors is an integer number (324189021).

Almost surely, 2^648378041 is an apocalyptic number.

It is an amenable number.

648378041 is a deficient number, since it is larger than the sum of its proper divisors (1).

648378041 is an equidigital number, since it uses as much as digits as its factorization.

648378041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 648378041 is about 25463.2684665579. The cubic root of 648378041 is about 865.5179901708.

The spelling of 648378041 in words is "six hundred forty-eight million, three hundred seventy-eight thousand, forty-one".