868891 has 2 divisors, whose sum is σ = 868892. Its totient is φ = 868890.

The previous prime is 868883. The next prime is 868909. The reversal of 868891 is 198868.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 868891 - 2³ = 868883 is a prime.

It is not a weakly prime, because it can be changed into another prime (868801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434445 + 434446.

It is an arithmetic number, because the mean of its divisors is an integer number (434446).

2⁸⁶⁸⁸⁹¹ is an apocalyptic number.

868891 is a deficient number, since it is larger than the sum of its proper divisors (1).

868891 is an equidigital number, since it uses as much as digits as its factorization.

868891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 40.

The square root of 868891 is about 932.1432293376. The cubic root of 868891 is about 95.4234467785.

The spelling of 868891 in words is "eight hundred sixty-eight thousand, eight hundred ninety-one".