65209281 has 16 divisors (see below), whose sum is σ = 89605824. Its totient is φ = 42151104.

The previous prime is 65209279. The next prime is 65209283. The reversal of 65209281 is 18290256.

It is an interprime number because it is at equal distance from previous prime (65209279) and next prime (65209283).

It is not a de Polignac number, because 65209281 - 2¹ = 65209279 is a prime.

It is a super-2 number, since 2×65209281² = 8504500657073922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65209283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37671 + ... + 39363.

It is an arithmetic number, because the mean of its divisors is an integer number (5600364).

Almost surely, 2^65209281 is an apocalyptic number.

It is an amenable number.

65209281 is a deficient number, since it is larger than the sum of its proper divisors (24396543).

65209281 is a wasteful number, since it uses less digits than its factorization.

65209281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 65209281 is about 8075.2263745359. The cubic root of 65209281 is about 402.5036322859.

The spelling of 65209281 in words is "sixty-five million, two hundred nine thousand, two hundred eighty-one".