649893049 has 27 divisors (see below), whose sum is σ = 737168103. Its totient is φ = 572674752.

The previous prime is 649893047. The next prime is 649893053. The reversal of 649893049 is 940398946.

The square root of 649893049 is 25493.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 145082025 + 504811024 = 12045^2 + 22468^2 .

It is not a de Polignac number, because 649893049 - 2¹ = 649893047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649892987 and 649893005.

It is not an unprimeable number, because it can be changed into a prime (649893047) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 12262107 + ... + 12262159.

Almost surely, 2^649893049 is an apocalyptic number.

649893049 is the 25493-rd square number.

649893049 is the 12747-th centered octagonal number.

It is an amenable number.

649893049 is a deficient number, since it is larger than the sum of its proper divisors (87275054).

649893049 is an equidigital number, since it uses as much as digits as its factorization.

649893049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 52.

The cubic root of 649893049 is about 866.1915924074.

The spelling of 649893049 in words is "six hundred forty-nine million, eight hundred ninety-three thousand, forty-nine".