649585945 has 8 divisors (see below), whose sum is σ = 779652936. Its totient is φ = 519568896.

The previous prime is 649585931. The next prime is 649585961. The reversal of 649585945 is 549585946.

It can be written as a sum of positive squares in 4 ways, for example, as 36132121 + 613453824 = 6011^2 + 24768^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 649585945 - 2¹¹ = 649583897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28179 + ... + 45751.

It is an arithmetic number, because the mean of its divisors is an integer number (97456617).

Almost surely, 2^649585945 is an apocalyptic number.

It is an amenable number.

649585945 is a deficient number, since it is larger than the sum of its proper divisors (130066991).

649585945 is a wasteful number, since it uses less digits than its factorization.

649585945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24971.

The product of its digits is 7776000, while the sum is 55.

The square root of 649585945 is about 25486.9759877472. The cubic root of 649585945 is about 866.0551326135.

Subtracting from 649585945 its reverse (549585946), we obtain a palindrome (99999999).

The spelling of 649585945 in words is "six hundred forty-nine million, five hundred eighty-five thousand, nine hundred forty-five".