648849281 has 2 divisors, whose sum is σ = 648849282. Its totient is φ = 648849280.

The previous prime is 648849203. The next prime is 648849293. The reversal of 648849281 is 182948846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529690225 + 119159056 = 23015^2 + 10916^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648849281 is a prime.

It is a super-2 number, since 2×648849281² = 842010778908433922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (648849881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324424640 + 324424641.

It is an arithmetic number, because the mean of its divisors is an integer number (324424641).

Almost surely, 2^648849281 is an apocalyptic number.

It is an amenable number.

648849281 is a deficient number, since it is larger than the sum of its proper divisors (1).

648849281 is an equidigital number, since it uses as much as digits as its factorization.

648849281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 884736, while the sum is 50.

The square root of 648849281 is about 25472.5201148218. The cubic root of 648849281 is about 865.7276250338.

The spelling of 648849281 in words is "six hundred forty-eight million, eight hundred forty-nine thousand, two hundred eighty-one".