647000221 has 16 divisors (see below), whose sum is σ = 752773248. Its totient is φ = 544593600.

The previous prime is 647000219. The next prime is 647000239. The reversal of 647000221 is 122000746.

It is a cyclic number.

It is not a de Polignac number, because 647000221 - 2¹ = 647000219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647000192 and 647000201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647000201) 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 15 ways as a sum of consecutive naturals, for example, 503646 + ... + 504928.

It is an arithmetic number, because the mean of its divisors is an integer number (47048328).

Almost surely, 2^647000221 is an apocalyptic number.

647000221 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

647000221 is a deficient number, since it is larger than the sum of its proper divisors (105773027).

647000221 is a wasteful number, since it uses less digits than its factorization.

647000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2532.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 647000221 is about 25436.1990281567. The cubic root of 647000221 is about 864.9044727278.

Adding to 647000221 its reverse (122000746), we get a palindrome (769000967).

The spelling of 647000221 in words is "six hundred forty-seven million, two hundred twenty-one", and thus it is an aban number.