64563281 has 2 divisors, whose sum is σ = 64563282. Its totient is φ = 64563280.

The previous prime is 64563269. The next prime is 64563313. The reversal of 64563281 is 18236546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63744256 + 819025 = 7984^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 64563281 - 2¹⁴ = 64546897 is a prime.

It is a super-2 number, since 2×64563281² = 8336834506969922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64563241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32281640 + 32281641.

It is an arithmetic number, because the mean of its divisors is an integer number (32281641).

Almost surely, 2^64563281 is an apocalyptic number.

It is an amenable number.

64563281 is a deficient number, since it is larger than the sum of its proper divisors (1).

64563281 is an equidigital number, since it uses as much as digits as its factorization.

64563281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 64563281 is about 8035.1279392428. The cubic root of 64563281 is about 401.1700760511.

The spelling of 64563281 in words is "sixty-four million, five hundred sixty-three thousand, two hundred eighty-one".