868121 has 2 divisors, whose sum is σ = 868122. Its totient is φ = 868120.

The previous prime is 868111. The next prime is 868123. The reversal of 868121 is 121868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 577600 + 290521 = 760^2 + 539^2 .

It is a cyclic number.

It is not a de Polignac number, because 868121 - 2¹⁸ = 605977 is a prime.

Together with 868123, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is a zygodrome in base 3.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 868121.

It is not a weakly prime, because it can be changed into another prime (868123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434060 + 434061.

It is an arithmetic number, because the mean of its divisors is an integer number (434061).

2⁸⁶⁸¹²¹ is an apocalyptic number.

It is an amenable number.

868121 is a deficient number, since it is larger than the sum of its proper divisors (1).

868121 is an equidigital number, since it uses as much as digits as its factorization.

868121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 26.

The square root of 868121 is about 931.7301111373. The cubic root of 868121 is about 95.3952507719.

Adding to 868121 its reverse (121868), we get a palindrome (989989).

It can be divided in two parts, 868 and 121, that added together give a palindrome (989).

The spelling of 868121 in words is "eight hundred sixty-eight thousand, one hundred twenty-one".