649864597 has 4 divisors (see below), whose sum is σ = 652944736. Its totient is φ = 646784460.

The previous prime is 649864577. The next prime is 649864643. The reversal of 649864597 is 795468946.

It is a happy number.

649864597 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 795468946 = 2 ⋅397734473.

It is a cyclic number.

It is not a de Polignac number, because 649864597 - 2¹⁵ = 649831829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649864577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1539753 + ... + 1540174.

It is an arithmetic number, because the mean of its divisors is an integer number (163236184).

Almost surely, 2^649864597 is an apocalyptic number.

It is an amenable number.

649864597 is a deficient number, since it is larger than the sum of its proper divisors (3080139).

649864597 is a wasteful number, since it uses less digits than its factorization.

649864597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080138.

The product of its digits is 13063680, while the sum is 58.

The square root of 649864597 is about 25492.4419583531. The cubic root of 649864597 is about 866.1789517414.

The spelling of 649864597 in words is "six hundred forty-nine million, eight hundred sixty-four thousand, five hundred ninety-seven".