647425221 has 16 divisors (see below), whose sum is σ = 884335104. Its totient is φ = 421187184.

The previous prime is 647425211. The next prime is 647425253. The reversal of 647425221 is 122524746.

It is not a de Polignac number, because 647425221 - 2⁹ = 647424709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647425201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6456 + ... + 36558.

It is an arithmetic number, because the mean of its divisors is an integer number (55270944).

Almost surely, 2^647425221 is an apocalyptic number.

It is an amenable number.

647425221 is a deficient number, since it is larger than the sum of its proper divisors (236909883).

647425221 is a wasteful number, since it uses less digits than its factorization.

647425221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30280.

The product of its digits is 26880, while the sum is 33.

The square root of 647425221 is about 25444.5518923010. The cubic root of 647425221 is about 865.0938100893.

Adding to 647425221 its reverse (122524746), we get a palindrome (769949967).

The spelling of 647425221 in words is "six hundred forty-seven million, four hundred twenty-five thousand, two hundred twenty-one".