649506281 has 2 divisors, whose sum is σ = 649506282. Its totient is φ = 649506280.

The previous prime is 649506217. The next prime is 649506311. The reversal of 649506281 is 182605946.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 648160681 + 1345600 = 25459^2 + 1160^2 .

It is a cyclic number.

It is not a de Polignac number, because 649506281 - 2⁶ = 649506217 is a prime.

It is a super-2 number, since 2×649506281² = 843716818116901922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (649500281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324753140 + 324753141.

It is an arithmetic number, because the mean of its divisors is an integer number (324753141).

Almost surely, 2^649506281 is an apocalyptic number.

It is an amenable number.

649506281 is a deficient number, since it is larger than the sum of its proper divisors (1).

649506281 is an equidigital number, since it uses as much as digits as its factorization.

649506281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 649506281 is about 25485.4131024004. The cubic root of 649506281 is about 866.0197273746.

The spelling of 649506281 in words is "six hundred forty-nine million, five hundred six thousand, two hundred eighty-one".