64463221 has 2 divisors, whose sum is σ = 64463222. Its totient is φ = 64463220.

The previous prime is 64463209. The next prime is 64463239. The reversal of 64463221 is 12236446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61858225 + 2604996 = 7865^2 + 1614^2 .

It is a cyclic number.

It is not a de Polignac number, because 64463221 - 2¹³ = 64455029 is a prime.

It is equal to p_3810862 and since 64463221 and 3810862 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64463221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64463821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32231610 + 32231611.

It is an arithmetic number, because the mean of its divisors is an integer number (32231611).

Almost surely, 2^64463221 is an apocalyptic number.

It is an amenable number.

64463221 is a deficient number, since it is larger than the sum of its proper divisors (1).

64463221 is an equidigital number, since it uses as much as digits as its factorization.

64463221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 28.

The square root of 64463221 is about 8028.8991150718. The cubic root of 64463221 is about 400.9627247935.

Adding to 64463221 its reverse (12236446), we get a palindrome (76699667).

The spelling of 64463221 in words is "sixty-four million, four hundred sixty-three thousand, two hundred twenty-one".