649598489 has 2 divisors, whose sum is σ = 649598490. Its totient is φ = 649598488.

The previous prime is 649598479. The next prime is 649598497. The reversal of 649598489 is 984895946.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639230089 + 10368400 = 25283^2 + 3220^2 .

It is a cyclic number.

It is not a de Polignac number, because 649598489 - 2⁴ = 649598473 is a prime.

It is a super-2 number, since 2×649598489² = 843956393822166242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (649598419) 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, 324799244 + 324799245.

It is an arithmetic number, because the mean of its divisors is an integer number (324799245).

Almost surely, 2^649598489 is an apocalyptic number.

It is an amenable number.

649598489 is a deficient number, since it is larger than the sum of its proper divisors (1).

649598489 is an equidigital number, since it uses as much as digits as its factorization.

649598489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22394880, while the sum is 62.

The square root of 649598489 is about 25487.2220730310. Note that the first 3 decimals coincide. The cubic root of 649598489 is about 866.0607073060.

The spelling of 649598489 in words is "six hundred forty-nine million, five hundred ninety-eight thousand, four hundred eighty-nine".