65673281 has 2 divisors, whose sum is σ = 65673282. Its totient is φ = 65673280.

The previous prime is 65673259. The next prime is 65673301. The reversal of 65673281 is 18237656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62663056 + 3010225 = 7916^2 + 1735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65673281 is a prime.

It is a super-2 number, since 2×65673281² = 8625959674609922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65673581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32836640 + 32836641.

It is an arithmetic number, because the mean of its divisors is an integer number (32836641).

Almost surely, 2^65673281 is an apocalyptic number.

It is an amenable number.

65673281 is a deficient number, since it is larger than the sum of its proper divisors (1).

65673281 is an equidigital number, since it uses as much as digits as its factorization.

65673281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 65673281 is about 8103.9052931287. The cubic root of 65673281 is about 403.4560552875.

It can be divided in two parts, 656 and 73281, that added together give a palindrome (73937).

The spelling of 65673281 in words is "sixty-five million, six hundred seventy-three thousand, two hundred eighty-one".