649518307 has 4 divisors (see below), whose sum is σ = 671915520. Its totient is φ = 627121096.

The previous prime is 649518283. The next prime is 649518323. The reversal of 649518307 is 703815946.

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 649518307 - 2¹⁵ = 649485539 is a prime.

It is a super-2 number, since 2×649518307² = 843748062256292498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649518007) 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, 11198563 + ... + 11198620.

It is an arithmetic number, because the mean of its divisors is an integer number (167978880).

Almost surely, 2^649518307 is an apocalyptic number.

649518307 is a deficient number, since it is larger than the sum of its proper divisors (22397213).

649518307 is a wasteful number, since it uses less digits than its factorization.

649518307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22397212.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 649518307 is about 25485.6490401952. The cubic root of 649518307 is about 866.0250723006.

The spelling of 649518307 in words is "six hundred forty-nine million, five hundred eighteen thousand, three hundred seven".