65729281 has 2 divisors, whose sum is σ = 65729282. Its totient is φ = 65729280.

The previous prime is 65729267. The next prime is 65729317. The reversal of 65729281 is 18292756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65351056 + 378225 = 8084^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 65729281 - 2⁵ = 65729249 is a prime.

It is a super-2 number, since 2×65729281² = 8640676761553922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65729201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32864640 + 32864641.

It is an arithmetic number, because the mean of its divisors is an integer number (32864641).

Almost surely, 2^65729281 is an apocalyptic number.

It is an amenable number.

65729281 is a deficient number, since it is larger than the sum of its proper divisors (1).

65729281 is an equidigital number, since it uses as much as digits as its factorization.

65729281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 40.

The square root of 65729281 is about 8107.3596811786. The cubic root of 65729281 is about 403.5706991726.

The spelling of 65729281 in words is "sixty-five million, seven hundred twenty-nine thousand, two hundred eighty-one".