65181 has 4 divisors (see below), whose sum is σ = 86912. Its totient is φ = 43452.

The previous prime is 65179. The next prime is 65183. The reversal of 65181 is 18156.

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.

It is an interprime number because it is at equal distance from previous prime (65179) and next prime (65183).

It is not a de Polignac number, because 65181 - 2¹ = 65179 is a prime.

It is a super-2 number, since 2×65181² = 8497125522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 65181.

It is not an unprimeable number, because it can be changed into a prime (65183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10861 + ... + 10866.

It is an arithmetic number, because the mean of its divisors is an integer number (21728).

2⁶⁵¹⁸¹ is an apocalyptic number.

It is an amenable number.

65181 is a deficient number, since it is larger than the sum of its proper divisors (21731).

65181 is a wasteful number, since it uses less digits than its factorization.

65181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21730.

The product of its digits is 240, while the sum is 21.

The square root of 65181 is about 255.3056991138. The cubic root of 65181 is about 40.2445435809.

The spelling of 65181 in words is "sixty-five thousand, one hundred eighty-one".