68394881 has 2 divisors, whose sum is σ = 68394882. Its totient is φ = 68394880.

The previous prime is 68394817. The next prime is 68394913. The reversal of 68394881 is 18849386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68227600 + 167281 = 8260^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 68394881 - 2⁶ = 68394817 is a prime.

It is a super-2 number, since 2×68394881² = 9355719494008322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68394181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34197440 + 34197441.

It is an arithmetic number, because the mean of its divisors is an integer number (34197441).

Almost surely, 2^68394881 is an apocalyptic number.

It is an amenable number.

68394881 is a deficient number, since it is larger than the sum of its proper divisors (1).

68394881 is an equidigital number, since it uses as much as digits as its factorization.

68394881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 47.

The square root of 68394881 is about 8270.1197693867. The cubic root of 68394881 is about 408.9540681278.

The spelling of 68394881 in words is "sixty-eight million, three hundred ninety-four thousand, eight hundred eighty-one".