68940881 has 2 divisors, whose sum is σ = 68940882. Its totient is φ = 68940880.

The previous prime is 68940857. The next prime is 68940889. The reversal of 68940881 is 18804986.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66569281 + 2371600 = 8159^2 + 1540^2 .

It is a cyclic number.

It is not a de Polignac number, because 68940881 - 2¹⁴ = 68924497 is a prime.

It is a super-2 number, since 2×68940881² = 9505690146112322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (68940889) 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, 34470440 + 34470441.

It is an arithmetic number, because the mean of its divisors is an integer number (34470441).

Almost surely, 2^68940881 is an apocalyptic number.

It is an amenable number.

68940881 is a deficient number, since it is larger than the sum of its proper divisors (1).

68940881 is an equidigital number, since it uses as much as digits as its factorization.

68940881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 68940881 is about 8303.0645547292. The cubic root of 68940881 is about 410.0394191725.

The spelling of 68940881 in words is "sixty-eight million, nine hundred forty thousand, eight hundred eighty-one".