68931893 has 2 divisors, whose sum is σ = 68931894. Its totient is φ = 68931892.

The previous prime is 68931839. The next prime is 68931899. The reversal of 68931893 is 39813986.

Together with previous prime (68931839) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45670564 + 23261329 = 6758^2 + 4823^2 .

It is a cyclic number.

It is not a de Polignac number, because 68931893 - 2¹² = 68927797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68931899) 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, 34465946 + 34465947.

It is an arithmetic number, because the mean of its divisors is an integer number (34465947).

Almost surely, 2^68931893 is an apocalyptic number.

It is an amenable number.

68931893 is a deficient number, since it is larger than the sum of its proper divisors (1).

68931893 is an equidigital number, since it uses as much as digits as its factorization.

68931893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 47.

The square root of 68931893 is about 8302.5232911447. The cubic root of 68931893 is about 410.0215991001.

The spelling of 68931893 in words is "sixty-eight million, nine hundred thirty-one thousand, eight hundred ninety-three".