649843361 has 2 divisors, whose sum is σ = 649843362. Its totient is φ = 649843360.

The previous prime is 649843319. The next prime is 649843367. The reversal of 649843361 is 163348946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639078400 + 10764961 = 25280^2 + 3281^2 .

It is a cyclic number.

It is not a de Polignac number, because 649843361 - 2¹⁰ = 649842337 is a prime.

It is not a weakly prime, because it can be changed into another prime (649843367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324921680 + 324921681.

It is an arithmetic number, because the mean of its divisors is an integer number (324921681).

Almost surely, 2^649843361 is an apocalyptic number.

It is an amenable number.

649843361 is a deficient number, since it is larger than the sum of its proper divisors (1).

649843361 is an equidigital number, since it uses as much as digits as its factorization.

649843361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 44.

The square root of 649843361 is about 25492.0254393408. The cubic root of 649843361 is about 866.1695167624.

The spelling of 649843361 in words is "six hundred forty-nine million, eight hundred forty-three thousand, three hundred sixty-one".