64601321 has 4 divisors (see below), whose sum is σ = 65267412. Its totient is φ = 63935232.

The previous prime is 64601287. The next prime is 64601323. The reversal of 64601321 is 12310646.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30250000 + 34351321 = 5500^2 + 5861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64601321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64601323) 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 in 3 ways as a sum of consecutive naturals, for example, 332900 + ... + 333093.

It is an arithmetic number, because the mean of its divisors is an integer number (16316853).

Almost surely, 2^64601321 is an apocalyptic number.

It is an amenable number.

64601321 is a deficient number, since it is larger than the sum of its proper divisors (666091).

64601321 is an equidigital number, since it uses as much as digits as its factorization.

64601321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666090.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 64601321 is about 8037.4946967323. The cubic root of 64601321 is about 401.2488489662.

Adding to 64601321 its reverse (12310646), we get a palindrome (76911967).

The spelling of 64601321 in words is "sixty-four million, six hundred one thousand, three hundred twenty-one".