649217633 has 2 divisors, whose sum is σ = 649217634. Its totient is φ = 649217632.

The previous prime is 649217603. The next prime is 649217659. The reversal of 649217633 is 336712946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 530473024 + 118744609 = 23032^2 + 10897^2 .

It is a cyclic number.

It is not a de Polignac number, because 649217633 - 2⁸ = 649217377 is a prime.

It is not a weakly prime, because it can be changed into another prime (649217603) 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, 324608816 + 324608817.

It is an arithmetic number, because the mean of its divisors is an integer number (324608817).

Almost surely, 2^649217633 is an apocalyptic number.

It is an amenable number.

649217633 is a deficient number, since it is larger than the sum of its proper divisors (1).

649217633 is an equidigital number, since it uses as much as digits as its factorization.

649217633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 41.

The square root of 649217633 is about 25479.7494689410. The cubic root of 649217633 is about 865.8914186837.

The spelling of 649217633 in words is "six hundred forty-nine million, two hundred seventeen thousand, six hundred thirty-three".