649641 has 8 divisors (see below), whose sum is σ = 876960. Its totient is φ = 427712.

The previous prime is 649639. The next prime is 649643. The reversal of 649641 is 146946.

It is an interprime number because it is at equal distance from previous prime (649639) and next prime (649643).

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 649641 - 2¹ = 649639 is a prime.

It is a Curzon number.

649641 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 649599 and 649608.

It is not an unprimeable number, because it can be changed into a prime (649643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1056 + ... + 1553.

It is an arithmetic number, because the mean of its divisors is an integer number (109620).

2⁶⁴⁹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

649641 is a deficient number, since it is larger than the sum of its proper divisors (227319).

649641 is a wasteful number, since it uses less digits than its factorization.

649641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2695.

The product of its digits is 5184, while the sum is 30.

The square root of 649641 is about 806.0031017310. The cubic root of 649641 is about 86.6079599131.

The spelling of 649641 in words is "six hundred forty-nine thousand, six hundred forty-one".