649513071 has 24 divisors (see below), whose sum is σ = 945859200. Its totient is φ = 429483600.

The previous prime is 649513063. The next prime is 649513153. The reversal of 649513071 is 170315946.

649513071 is a `hidden beast` number, since 649 + 5 + 1 + 3 + 0 + 7 + 1 = 666.

It is not a de Polignac number, because 649513071 - 2³ = 649513063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649513471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1084030 + ... + 1084628.

It is an arithmetic number, because the mean of its divisors is an integer number (39410800).

Almost surely, 2^649513071 is an apocalyptic number.

649513071 is a deficient number, since it is larger than the sum of its proper divisors (296346129).

649513071 is a wasteful number, since it uses less digits than its factorization.

649513071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387 (or 1384 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 649513071 is about 25485.5463155099. The cubic root of 649513071 is about 866.0227451815.

The spelling of 649513071 in words is "six hundred forty-nine million, five hundred thirteen thousand, seventy-one".