64573321 has 2 divisors, whose sum is σ = 64573322. Its totient is φ = 64573320.

The previous prime is 64573307. The next prime is 64573331. The reversal of 64573321 is 12337546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63441225 + 1132096 = 7965^2 + 1064^2 .

It is a cyclic number.

It is not a de Polignac number, because 64573321 - 2¹⁹ = 64049033 is a prime.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (64573331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32286660 + 32286661.

It is an arithmetic number, because the mean of its divisors is an integer number (32286661).

Almost surely, 2^64573321 is an apocalyptic number.

It is an amenable number.

64573321 is a deficient number, since it is larger than the sum of its proper divisors (1).

64573321 is an equidigital number, since it uses as much as digits as its factorization.

64573321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 31.

The square root of 64573321 is about 8035.7526716543. The cubic root of 64573321 is about 401.1908698043.

The spelling of 64573321 in words is "sixty-four million, five hundred seventy-three thousand, three hundred twenty-one".