649615247 has 8 divisors (see below), whose sum is σ = 672528576. Its totient is φ = 627080832.

The previous prime is 649615217. The next prime is 649615273. The reversal of 649615247 is 742516946.

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 649615247 - 2²² = 645420943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649615198 and 649615207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649615217) 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 7 ways as a sum of consecutive naturals, for example, 91238 + ... + 98099.

It is an arithmetic number, because the mean of its divisors is an integer number (84066072).

Almost surely, 2^649615247 is an apocalyptic number.

649615247 is a deficient number, since it is larger than the sum of its proper divisors (22913329).

649615247 is a wasteful number, since it uses less digits than its factorization.

649615247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189457.

The product of its digits is 362880, while the sum is 44.

The square root of 649615247 is about 25487.5508238826. The cubic root of 649615247 is about 866.0681546348.

The spelling of 649615247 in words is "six hundred forty-nine million, six hundred fifteen thousand, two hundred forty-seven".