648121811 has 2 divisors, whose sum is σ = 648121812. Its totient is φ = 648121810.

The previous prime is 648121801. The next prime is 648121819. The reversal of 648121811 is 118121846.

It is a happy number.

648121811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648121811 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (648121819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324060905 + 324060906.

It is an arithmetic number, because the mean of its divisors is an integer number (324060906).

Almost surely, 2^648121811 is an apocalyptic number.

648121811 is a deficient number, since it is larger than the sum of its proper divisors (1).

648121811 is an equidigital number, since it uses as much as digits as its factorization.

648121811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 32.

The square root of 648121811 is about 25458.2366042898. The cubic root of 648121811 is about 865.4039615842.

The spelling of 648121811 in words is "six hundred forty-eight million, one hundred twenty-one thousand, eight hundred eleven".