65081 has 4 divisors (see below), whose sum is σ = 65664. Its totient is φ = 64500.

The previous prime is 65071. The next prime is 65089. The reversal of 65081 is 18056.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65081 is a prime.

It is a super-2 number, since 2×65081² = 8471073122, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 65081.

It is not an unprimeable number, because it can be changed into a prime (65089) 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 in 3 ways as a sum of consecutive naturals, for example, 65 + ... + 366.

It is an arithmetic number, because the mean of its divisors is an integer number (16416).

2⁶⁵⁰⁸¹ is an apocalyptic number.

It is an amenable number.

65081 is a deficient number, since it is larger than the sum of its proper divisors (583).

65081 is a wasteful number, since it uses less digits than its factorization.

65081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 65081 is about 255.1097802908. The cubic root of 65081 is about 40.2239521294.

It can be divided in two parts, 650 and 81, that multiplied together give a triangular number (52650 = T₃₂₄).

The spelling of 65081 in words is "sixty-five thousand, eighty-one".