649385511 has 16 divisors (see below), whose sum is σ = 905845248. Its totient is φ = 413374400.

The previous prime is 649385497. The next prime is 649385579. The reversal of 649385511 is 115583946.

It is not a de Polignac number, because 649385511 - 2⁹ = 649384999 is a prime.

It is a super-2 number, since 2×649385511² = 843403083793462242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649385411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50385 + ... + 61946.

It is an arithmetic number, because the mean of its divisors is an integer number (56615328).

Almost surely, 2^649385511 is an apocalyptic number.

649385511 is a deficient number, since it is larger than the sum of its proper divisors (256459737).

649385511 is a wasteful number, since it uses less digits than its factorization.

649385511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112422.

The product of its digits is 129600, while the sum is 42.

The square root of 649385511 is about 25483.0435976553. The cubic root of 649385511 is about 865.9660477882.

The spelling of 649385511 in words is "six hundred forty-nine million, three hundred eighty-five thousand, five hundred eleven".