68075221 has 2 divisors, whose sum is σ = 68075222. Its totient is φ = 68075220.

The previous prime is 68075213. The next prime is 68075237. The reversal of 68075221 is 12257086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49196196 + 18879025 = 7014^2 + 4345^2 .

It is a cyclic number.

It is not a de Polignac number, because 68075221 - 2³ = 68075213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68075251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34037610 + 34037611.

It is an arithmetic number, because the mean of its divisors is an integer number (34037611).

Almost surely, 2^68075221 is an apocalyptic number.

It is an amenable number.

68075221 is a deficient number, since it is larger than the sum of its proper divisors (1).

68075221 is an equidigital number, since it uses as much as digits as its factorization.

68075221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 68075221 is about 8250.7709336764. The cubic root of 68075221 is about 408.3159577594.

The spelling of 68075221 in words is "sixty-eight million, seventy-five thousand, two hundred twenty-one".