64602221 has 2 divisors, whose sum is σ = 64602222. Its totient is φ = 64602220.

The previous prime is 64602199. The next prime is 64602253. The reversal of 64602221 is 12220646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50055625 + 14546596 = 7075^2 + 3814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64602221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64602521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32301110 + 32301111.

It is an arithmetic number, because the mean of its divisors is an integer number (32301111).

Almost surely, 2^64602221 is an apocalyptic number.

It is an amenable number.

64602221 is a deficient number, since it is larger than the sum of its proper divisors (1).

64602221 is an equidigital number, since it uses as much as digits as its factorization.

64602221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 64602221 is about 8037.5506841326. The cubic root of 64602221 is about 401.2507123042.

Adding to 64602221 its reverse (12220646), we get a palindrome (76822867).

The spelling of 64602221 in words is "sixty-four million, six hundred two thousand, two hundred twenty-one".