64444213 has 2 divisors, whose sum is σ = 64444214. Its totient is φ = 64444212.

The previous prime is 64444207. The next prime is 64444231. The reversal of 64444213 is 31244446.

Together with next prime (64444231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38464804 + 25979409 = 6202^2 + 5097^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64444213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64444273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32222106 + 32222107.

It is an arithmetic number, because the mean of its divisors is an integer number (32222107).

Almost surely, 2^64444213 is an apocalyptic number.

It is an amenable number.

64444213 is a deficient number, since it is larger than the sum of its proper divisors (1).

64444213 is an equidigital number, since it uses as much as digits as its factorization.

64444213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 28.

The square root of 64444213 is about 8027.7153038707. The cubic root of 64444213 is about 400.9233108528.

Adding to 64444213 its reverse (31244446), we get a palindrome (95688659).

The spelling of 64444213 in words is "sixty-four million, four hundred forty-four thousand, two hundred thirteen".