649449617 has 2 divisors, whose sum is σ = 649449618. Its totient is φ = 649449616.

The previous prime is 649449571. The next prime is 649449649. The reversal of 649449617 is 716944946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 356492161 + 292957456 = 18881^2 + 17116^2 .

It is a cyclic number.

It is not a de Polignac number, because 649449617 - 2¹⁴ = 649433233 is a prime.

It is not a weakly prime, because it can be changed into another prime (649449667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324724808 + 324724809.

It is an arithmetic number, because the mean of its divisors is an integer number (324724809).

Almost surely, 2^649449617 is an apocalyptic number.

It is an amenable number.

649449617 is a deficient number, since it is larger than the sum of its proper divisors (1).

649449617 is an equidigital number, since it uses as much as digits as its factorization.

649449617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The square root of 649449617 is about 25484.3013834007. The cubic root of 649449617 is about 865.9945423121.

The spelling of 649449617 in words is "six hundred forty-nine million, four hundred forty-nine thousand, six hundred seventeen".