649857163 has 2 divisors, whose sum is σ = 649857164. Its totient is φ = 649857162.

The previous prime is 649857161. The next prime is 649857191. The reversal of 649857163 is 361758946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649857163 - 2¹ = 649857161 is a prime.

It is a super-3 number, since 3×649857163³ (a number of 27 digits) contains 333 as substring.

Together with 649857161, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (649857161) 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, 324928581 + 324928582.

It is an arithmetic number, because the mean of its divisors is an integer number (324928582).

Almost surely, 2^649857163 is an apocalyptic number.

649857163 is a deficient number, since it is larger than the sum of its proper divisors (1).

649857163 is an equidigital number, since it uses as much as digits as its factorization.

649857163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 49.

The square root of 649857163 is about 25492.2961500136. The cubic root of 649857163 is about 866.1756489002.

The spelling of 649857163 in words is "six hundred forty-nine million, eight hundred fifty-seven thousand, one hundred sixty-three".