64447213 has 2 divisors, whose sum is σ = 64447214. Its totient is φ = 64447212.

The previous prime is 64447189. The next prime is 64447217. The reversal of 64447213 is 31274446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48622729 + 15824484 = 6973^2 + 3978^2 .

It is a cyclic number.

It is not a de Polignac number, because 64447213 - 2⁵ = 64447181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64447217) 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, 32223606 + 32223607.

It is an arithmetic number, because the mean of its divisors is an integer number (32223607).

Almost surely, 2^64447213 is an apocalyptic number.

It is an amenable number.

64447213 is a deficient number, since it is larger than the sum of its proper divisors (1).

64447213 is an equidigital number, since it uses as much as digits as its factorization.

64447213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 31.

The square root of 64447213 is about 8027.9021543614. The cubic root of 64447213 is about 400.9295320024.

The spelling of 64447213 in words is "sixty-four million, four hundred forty-seven thousand, two hundred thirteen".