648614221 has 2 divisors, whose sum is σ = 648614222. Its totient is φ = 648614220.

The previous prime is 648614189. The next prime is 648614227. The reversal of 648614221 is 122416846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 646684900 + 1929321 = 25430^2 + 1389^2 .

It is a cyclic number.

It is not a de Polignac number, because 648614221 - 2⁵ = 648614189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648614227) 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, 324307110 + 324307111.

It is an arithmetic number, because the mean of its divisors is an integer number (324307111).

Almost surely, 2^648614221 is an apocalyptic number.

It is an amenable number.

648614221 is a deficient number, since it is larger than the sum of its proper divisors (1).

648614221 is an equidigital number, since it uses as much as digits as its factorization.

648614221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 34.

The square root of 648614221 is about 25467.9057050241. The cubic root of 648614221 is about 865.6230694149.

The spelling of 648614221 in words is "six hundred forty-eight million, six hundred fourteen thousand, two hundred twenty-one".