64721441 has 2 divisors, whose sum is σ = 64721442. Its totient is φ = 64721440.

The previous prime is 64721383. The next prime is 64721477. The reversal of 64721441 is 14412746.

It is a happy number.

64721441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59613841 + 5107600 = 7721^2 + 2260^2 .

It is a cyclic number.

It is not a de Polignac number, because 64721441 - 2¹⁰ = 64720417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64721141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32360720 + 32360721.

It is an arithmetic number, because the mean of its divisors is an integer number (32360721).

Almost surely, 2^64721441 is an apocalyptic number.

It is an amenable number.

64721441 is a deficient number, since it is larger than the sum of its proper divisors (1).

64721441 is an equidigital number, since it uses as much as digits as its factorization.

64721441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 29.

The square root of 64721441 is about 8044.9637040822. The cubic root of 64721441 is about 401.4973896493.

The spelling of 64721441 in words is "sixty-four million, seven hundred twenty-one thousand, four hundred forty-one".