649937569 has 8 divisors (see below), whose sum is σ = 673427520. Its totient is φ = 626863536.

The previous prime is 649937567. The next prime is 649937609. The reversal of 649937569 is 965739946.

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 649937569 - 2¹ = 649937567 is a prime.

It is a super-2 number, since 2×649937569² = 844837687195259522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649937567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100797 + ... + 107050.

It is an arithmetic number, because the mean of its divisors is an integer number (84178440).

Almost surely, 2^649937569 is an apocalyptic number.

It is an amenable number.

649937569 is a deficient number, since it is larger than the sum of its proper divisors (23489951).

649937569 is a wasteful number, since it uses less digits than its factorization.

649937569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207959.

The product of its digits is 11022480, while the sum is 58.

The square root of 649937569 is about 25493.8731659197. The cubic root of 649937569 is about 866.2113710306.

The spelling of 649937569 in words is "six hundred forty-nine million, nine hundred thirty-seven thousand, five hundred sixty-nine".