68607221 has 2 divisors, whose sum is σ = 68607222. Its totient is φ = 68607220.

The previous prime is 68607197. The next prime is 68607239. The reversal of 68607221 is 12270686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56040196 + 12567025 = 7486^2 + 3545^2 .

It is a cyclic number.

It is not a de Polignac number, because 68607221 - 2¹⁸ = 68345077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68607241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34303610 + 34303611.

It is an arithmetic number, because the mean of its divisors is an integer number (34303611).

Almost surely, 2^68607221 is an apocalyptic number.

It is an amenable number.

68607221 is a deficient number, since it is larger than the sum of its proper divisors (1).

68607221 is an equidigital number, since it uses as much as digits as its factorization.

68607221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 68607221 is about 8282.9476033596. The cubic root of 68607221 is about 409.3768463371.

The spelling of 68607221 in words is "sixty-eight million, six hundred seven thousand, two hundred twenty-one".