68921441 has 2 divisors, whose sum is σ = 68921442. Its totient is φ = 68921440.

The previous prime is 68921407. The next prime is 68921459. The reversal of 68921441 is 14412986.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38440000 + 30481441 = 6200^2 + 5521^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68921441 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (68921141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34460720 + 34460721.

It is an arithmetic number, because the mean of its divisors is an integer number (34460721).

Almost surely, 2^68921441 is an apocalyptic number.

It is an amenable number.

68921441 is a deficient number, since it is larger than the sum of its proper divisors (1).

68921441 is an equidigital number, since it uses as much as digits as its factorization.

68921441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 35.

The square root of 68921441 is about 8301.8938200871. The cubic root of 68921441 is about 410.0008744776. Note that the first 3 decimals are identical.

The spelling of 68921441 in words is "sixty-eight million, nine hundred twenty-one thousand, four hundred forty-one".