68921543 has 2 divisors, whose sum is σ = 68921544. Its totient is φ = 68921542.

The previous prime is 68921483. The next prime is 68921551. The reversal of 68921543 is 34512986.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68921543 - 2¹² = 68917447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68921497 and 68921506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68921143) 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, 34460771 + 34460772.

It is an arithmetic number, because the mean of its divisors is an integer number (34460772).

Almost surely, 2^68921543 is an apocalyptic number.

68921543 is a deficient number, since it is larger than the sum of its proper divisors (1).

68921543 is an equidigital number, since it uses as much as digits as its factorization.

68921543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 68921543 is about 8301.8999632614. The cubic root of 68921543 is about 410.0010767372.

The spelling of 68921543 in words is "sixty-eight million, nine hundred twenty-one thousand, five hundred forty-three".