868181 has 4 divisors (see below), whose sum is σ = 905952. Its totient is φ = 830412.

The previous prime is 868177. The next prime is 868199. The reversal of 868181 is 181868.

It is a happy number.

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 868181 - 2² = 868177 is a prime.

It is a super-2 number, since 2×868181² = 1507476497522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

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 868181.

It is not an unprimeable number, because it can be changed into a prime (868111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18851 + ... + 18896.

It is an arithmetic number, because the mean of its divisors is an integer number (226488).

2⁸⁶⁸¹⁸¹ is an apocalyptic number.

It is an amenable number.

868181 is a deficient number, since it is larger than the sum of its proper divisors (37771).

868181 is a wasteful number, since it uses less digits than its factorization.

868181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37770.

The product of its digits is 3072, while the sum is 32.

The square root of 868181 is about 931.7623087462. The cubic root of 868181 is about 95.3974484621.

The spelling of 868181 in words is "eight hundred sixty-eight thousand, one hundred eighty-one".