868691 has 2 divisors, whose sum is σ = 868692. Its totient is φ = 868690.

The previous prime is 868669. The next prime is 868697. The reversal of 868691 is 196868.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-868691 is a prime.

It is not a weakly prime, because it can be changed into another prime (868697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434345 + 434346.

It is an arithmetic number, because the mean of its divisors is an integer number (434346).

2⁸⁶⁸⁶⁹¹ is an apocalyptic number.

868691 is a deficient number, since it is larger than the sum of its proper divisors (1).

868691 is an equidigital number, since it uses as much as digits as its factorization.

868691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 868691 is about 932.0359435129. The cubic root of 868691 is about 95.4161247424.

The spelling of 868691 in words is "eight hundred sixty-eight thousand, six hundred ninety-one".