68508221 has 2 divisors, whose sum is σ = 68508222. Its totient is φ = 68508220.

The previous prime is 68508163. The next prime is 68508227. The reversal of 68508221 is 12280586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36132121 + 32376100 = 6011^2 + 5690^2 .

It is a cyclic number.

It is not a de Polignac number, because 68508221 - 2²⁶ = 1399357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68508227) 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, 34254110 + 34254111.

It is an arithmetic number, because the mean of its divisors is an integer number (34254111).

Almost surely, 2^68508221 is an apocalyptic number.

It is an amenable number.

68508221 is a deficient number, since it is larger than the sum of its proper divisors (1).

68508221 is an equidigital number, since it uses as much as digits as its factorization.

68508221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 68508221 is about 8276.9693124960. The cubic root of 68508221 is about 409.1798417219.

The spelling of 68508221 in words is "sixty-eight million, five hundred eight thousand, two hundred twenty-one".