868210691 has 2 divisors, whose sum is σ = 868210692. Its totient is φ = 868210690.

The previous prime is 868210669. The next prime is 868210699. The reversal of 868210691 is 196012868.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-868210691 is a prime.

It is not a weakly prime, because it can be changed into another prime (868210699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434105345 + 434105346.

It is an arithmetic number, because the mean of its divisors is an integer number (434105346).

Almost surely, 2^868210691 is an apocalyptic number.

868210691 is a deficient number, since it is larger than the sum of its proper divisors (1).

868210691 is an equidigital number, since it uses as much as digits as its factorization.

868210691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 868210691 is about 29465.4151676164. The cubic root of 868210691 is about 953.9853595170.

The spelling of 868210691 in words is "eight hundred sixty-eight million, two hundred ten thousand, six hundred ninety-one".