68745221 has 2 divisors, whose sum is σ = 68745222. Its totient is φ = 68745220.

The previous prime is 68745203. The next prime is 68745241. The reversal of 68745221 is 12254786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56460196 + 12285025 = 7514^2 + 3505^2 .

It is a cyclic number.

It is not a de Polignac number, because 68745221 - 2¹⁴ = 68728837 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_4048568 and since 68745221 and 4048568 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68745241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34372610 + 34372611.

It is an arithmetic number, because the mean of its divisors is an integer number (34372611).

Almost surely, 2^68745221 is an apocalyptic number.

It is an amenable number.

68745221 is a deficient number, since it is larger than the sum of its proper divisors (1).

68745221 is an equidigital number, since it uses as much as digits as its factorization.

68745221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 35.

The square root of 68745221 is about 8291.2737863371. The cubic root of 68745221 is about 409.6511428710.

The spelling of 68745221 in words is "sixty-eight million, seven hundred forty-five thousand, two hundred twenty-one".