649317515 has 32 divisors (see below), whose sum is σ = 981517824. Its totient is φ = 400573440.

The previous prime is 649317503. The next prime is 649317517. The reversal of 649317515 is 515713946.

It is not a de Polignac number, because 649317515 - 2¹⁰ = 649316491 is a prime.

It is a super-2 number, since 2×649317515² = 843226470571550450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649317517) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28652 + ... + 46038.

It is an arithmetic number, because the mean of its divisors is an integer number (30672432).

Almost surely, 2^649317515 is an apocalyptic number.

649317515 is a deficient number, since it is larger than the sum of its proper divisors (332200309).

649317515 is a wasteful number, since it uses less digits than its factorization.

649317515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17507.

The product of its digits is 113400, while the sum is 41.

The square root of 649317515 is about 25481.7094206806. The cubic root of 649317515 is about 865.9358221458.

The spelling of 649317515 in words is "six hundred forty-nine million, three hundred seventeen thousand, five hundred fifteen".