64135321 has 2 divisors, whose sum is σ = 64135322. Its totient is φ = 64135320.

The previous prime is 64135289. The next prime is 64135361. The reversal of 64135321 is 12353146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63920025 + 215296 = 7995^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 64135321 - 2⁵ = 64135289 is a prime.

It is a super-2 number, since 2×64135321² = 8226678799546082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64135361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32067660 + 32067661.

It is an arithmetic number, because the mean of its divisors is an integer number (32067661).

Almost surely, 2^64135321 is an apocalyptic number.

It is an amenable number.

64135321 is a deficient number, since it is larger than the sum of its proper divisors (1).

64135321 is an equidigital number, since it uses as much as digits as its factorization.

64135321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 64135321 is about 8008.4530965724. The cubic root of 64135321 is about 400.2817202876.

Adding to 64135321 its reverse (12353146), we get a palindrome (76488467).

The spelling of 64135321 in words is "sixty-four million, one hundred thirty-five thousand, three hundred twenty-one".