68810891 has 2 divisors, whose sum is σ = 68810892. Its totient is φ = 68810890.

The previous prime is 68810839. The next prime is 68810893. The reversal of 68810891 is 19801886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68810891 - 2⁶ = 68810827 is a prime.

Together with 68810893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68810893) 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 as a sum of consecutive naturals, namely, 34405445 + 34405446.

It is an arithmetic number, because the mean of its divisors is an integer number (34405446).

Almost surely, 2^68810891 is an apocalyptic number.

68810891 is a deficient number, since it is larger than the sum of its proper divisors (1).

68810891 is an equidigital number, since it uses as much as digits as its factorization.

68810891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 68810891 is about 8295.2330286738. The cubic root of 68810891 is about 409.7815433487.

The spelling of 68810891 in words is "sixty-eight million, eight hundred ten thousand, eight hundred ninety-one".