649476561 has 8 divisors (see below), whose sum is σ = 874543104. Its totient is φ = 428697200.

The previous prime is 649476557. The next prime is 649476589. The reversal of 649476561 is 165674946.

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 649476561 - 2² = 649476557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 649476561.

It is not an unprimeable number, because it can be changed into a prime (649472561) 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, 1071441 + ... + 1072046.

It is an arithmetic number, because the mean of its divisors is an integer number (109317888).

Almost surely, 2^649476561 is an apocalyptic number.

It is an amenable number.

649476561 is a deficient number, since it is larger than the sum of its proper divisors (225066543).

649476561 is a wasteful number, since it uses less digits than its factorization.

649476561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143591.

The product of its digits is 1088640, while the sum is 48.

The square root of 649476561 is about 25484.8300170906. The cubic root of 649476561 is about 866.0065181111.

The spelling of 649476561 in words is "six hundred forty-nine million, four hundred seventy-six thousand, five hundred sixty-one".