649955939 has 4 divisors (see below), whose sum is σ = 659110320. Its totient is φ = 640801560.

The previous prime is 649955923. The next prime is 649955941. The reversal of 649955939 is 939559946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 649955939 - 2⁴ = 649955923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649955909) 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, 4577084 + ... + 4577225.

It is an arithmetic number, because the mean of its divisors is an integer number (164777580).

Almost surely, 2^649955939 is an apocalyptic number.

649955939 is a deficient number, since it is larger than the sum of its proper divisors (9154381).

649955939 is an equidigital number, since it uses as much as digits as its factorization.

649955939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9154380.

The product of its digits is 11809800, while the sum is 59.

The square root of 649955939 is about 25494.2334460168. The cubic root of 649955939 is about 866.2195318929.

The spelling of 649955939 in words is "six hundred forty-nine million, nine hundred fifty-five thousand, nine hundred thirty-nine".