68094781 has 2 divisors, whose sum is σ = 68094782. Its totient is φ = 68094780.

The previous prime is 68094739. The next prime is 68094787. The reversal of 68094781 is 18749086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62647225 + 5447556 = 7915^2 + 2334^2 .

It is a cyclic number.

It is not a de Polignac number, because 68094781 - 2⁹ = 68094269 is a prime.

It is a super-2 number, since 2×68094781² = 9273798398875922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68094787) 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, 34047390 + 34047391.

It is an arithmetic number, because the mean of its divisors is an integer number (34047391).

Almost surely, 2^68094781 is an apocalyptic number.

It is an amenable number.

68094781 is a deficient number, since it is larger than the sum of its proper divisors (1).

68094781 is an equidigital number, since it uses as much as digits as its factorization.

68094781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 68094781 is about 8251.9561923219. The cubic root of 68094781 is about 408.3550610494.

The spelling of 68094781 in words is "sixty-eight million, ninety-four thousand, seven hundred eighty-one".