64554221 has 2 divisors, whose sum is σ = 64554222. Its totient is φ = 64554220.

The previous prime is 64554211. The next prime is 64554239. The reversal of 64554221 is 12245546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56460196 + 8094025 = 7514^2 + 2845^2 .

It is a cyclic number.

It is not a de Polignac number, because 64554221 - 2⁶ = 64554157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64554211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32277110 + 32277111.

It is an arithmetic number, because the mean of its divisors is an integer number (32277111).

Almost surely, 2^64554221 is an apocalyptic number.

It is an amenable number.

64554221 is a deficient number, since it is larger than the sum of its proper divisors (1).

64554221 is an equidigital number, since it uses as much as digits as its factorization.

64554221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 29.

The square root of 64554221 is about 8034.5641449926. The cubic root of 64554221 is about 401.1513101165.

Adding to 64554221 its reverse (12245546), we get a palindrome (76799767).

The spelling of 64554221 in words is "sixty-four million, five hundred fifty-four thousand, two hundred twenty-one".