65481281 has 2 divisors, whose sum is σ = 65481282. Its totient is φ = 65481280.

The previous prime is 65481211. The next prime is 65481289. The reversal of 65481281 is 18218456.

65481281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61481281 + 4000000 = 7841^2 + 2000^2 .

It is a cyclic number.

It is not a de Polignac number, because 65481281 - 2¹⁴ = 65464897 is a prime.

It is a super-2 number, since 2×65481281² = 8575596322801922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65481289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32740640 + 32740641.

It is an arithmetic number, because the mean of its divisors is an integer number (32740641).

Almost surely, 2^65481281 is an apocalyptic number.

It is an amenable number.

65481281 is a deficient number, since it is larger than the sum of its proper divisors (1).

65481281 is an equidigital number, since it uses as much as digits as its factorization.

65481281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15360, while the sum is 35.

The square root of 65481281 is about 8092.0504818000. The cubic root of 65481281 is about 403.0624950544.

The spelling of 65481281 in words is "sixty-five million, four hundred eighty-one thousand, two hundred eighty-one".