68333521 has 2 divisors, whose sum is σ = 68333522. Its totient is φ = 68333520.

The previous prime is 68333509. The next prime is 68333537. The reversal of 68333521 is 12533386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46580625 + 21752896 = 6825^2 + 4664^2 .

It is a cyclic number.

It is not a de Polignac number, because 68333521 - 2⁹ = 68333009 is a prime.

It is not a weakly prime, because it can be changed into another prime (68333581) 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, 34166760 + 34166761.

It is an arithmetic number, because the mean of its divisors is an integer number (34166761).

Almost surely, 2^68333521 is an apocalyptic number.

It is an amenable number.

68333521 is a deficient number, since it is larger than the sum of its proper divisors (1).

68333521 is an equidigital number, since it uses as much as digits as its factorization.

68333521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

The square root of 68333521 is about 8266.4091962593. The cubic root of 68333521 is about 408.8317347546.

The spelling of 68333521 in words is "sixty-eight million, three hundred thirty-three thousand, five hundred twenty-one".