648836281 has 2 divisors, whose sum is σ = 648836282. Its totient is φ = 648836280.

The previous prime is 648836273. The next prime is 648836303. The reversal of 648836281 is 182638846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359292025 + 289544256 = 18955^2 + 17016^2 .

It is a cyclic number.

It is not a de Polignac number, because 648836281 - 2³ = 648836273 is a prime.

It is a super-2 number, since 2×648836281² = 841977039083821922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (648836381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324418140 + 324418141.

It is an arithmetic number, because the mean of its divisors is an integer number (324418141).

Almost surely, 2^648836281 is an apocalyptic number.

It is an amenable number.

648836281 is a deficient number, since it is larger than the sum of its proper divisors (1).

648836281 is an equidigital number, since it uses as much as digits as its factorization.

648836281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 442368, while the sum is 46.

The square root of 648836281 is about 25472.2649365933. The cubic root of 648836281 is about 865.7218432420.

The spelling of 648836281 in words is "six hundred forty-eight million, eight hundred thirty-six thousand, two hundred eighty-one".