649341221 has 32 divisors (see below), whose sum is σ = 721944576. Its totient is φ = 582120000.

The previous prime is 649341191. The next prime is 649341247. The reversal of 649341221 is 122143946.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649341221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649341271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5112860 + ... + 5112986.

It is an arithmetic number, because the mean of its divisors is an integer number (22560768).

Almost surely, 2^649341221 is an apocalyptic number.

It is an amenable number.

649341221 is a deficient number, since it is larger than the sum of its proper divisors (72603355).

649341221 is a wasteful number, since it uses less digits than its factorization.

649341221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353.

The product of its digits is 10368, while the sum is 32.

The square root of 649341221 is about 25482.1745736113. The cubic root of 649341221 is about 865.9463601976.

The spelling of 649341221 in words is "six hundred forty-nine million, three hundred forty-one thousand, two hundred twenty-one".