68181 has 4 divisors (see below), whose sum is σ = 90912. Its totient is φ = 45452.

The previous prime is 68171. The next prime is 68207. The reversal of 68181 is 18186.

68181 = 83² + 84² + ... + 91².

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 a cyclic number.

It is not a de Polignac number, because 68181 - 2⁷ = 68053 is a prime.

It is a super-2 number, since 2×68181² = 9297297522, which contains 22 as substring.

It is a D-number.

68181 is a lucky number.

It is a plaindrome in base 9 and base 12.

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 68181.

It is not an unprimeable number, because it can be changed into a prime (68111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11361 + ... + 11366.

It is an arithmetic number, because the mean of its divisors is an integer number (22728).

2⁶⁸¹⁸¹ is an apocalyptic number.

It is an amenable number.

68181 is a deficient number, since it is larger than the sum of its proper divisors (22731).

68181 is a wasteful number, since it uses less digits than its factorization.

68181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22730.

The product of its digits is 384, while the sum is 24.

The square root of 68181 is about 261.1149172299. The cubic root of 68181 is about 40.8527336199.

The spelling of 68181 in words is "sixty-eight thousand, one hundred eighty-one".