649883539 has 2 divisors, whose sum is σ = 649883540. Its totient is φ = 649883538.

The previous prime is 649883513. The next prime is 649883621. The reversal of 649883539 is 935388946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649883539 - 2¹⁵ = 649850771 is a prime.

It is a super-2 number, since 2×649883539² = 844697228526329042, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 649883539.

It is not a weakly prime, because it can be changed into another prime (649893539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324941769 + 324941770.

It is an arithmetic number, because the mean of its divisors is an integer number (324941770).

Almost surely, 2^649883539 is an apocalyptic number.

649883539 is a deficient number, since it is larger than the sum of its proper divisors (1).

649883539 is an equidigital number, since it uses as much as digits as its factorization.

649883539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 55.

The square root of 649883539 is about 25492.8134775273. The cubic root of 649883539 is about 866.1873673419.

The spelling of 649883539 in words is "six hundred forty-nine million, eight hundred eighty-three thousand, five hundred thirty-nine".