68209243 has 4 divisors (see below), whose sum is σ = 68230008. Its totient is φ = 68188480.

The previous prime is 68209181. The next prime is 68209261. The reversal of 68209243 is 34290286.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68209243 - 2²¹ = 66112091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68209199 and 68209208.

It is not an unprimeable number, because it can be changed into a prime (68209343) 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 in 3 ways as a sum of consecutive naturals, for example, 4246 + ... + 12427.

It is an arithmetic number, because the mean of its divisors is an integer number (17057502).

Almost surely, 2^68209243 is an apocalyptic number.

68209243 is a deficient number, since it is larger than the sum of its proper divisors (20765).

68209243 is a wasteful number, since it uses less digits than its factorization.

68209243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20764.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 68209243 is about 8258.8887266993. Note that the first 3 decimals coincide. The cubic root of 68209243 is about 408.5837372727.

The spelling of 68209243 in words is "sixty-eight million, two hundred nine thousand, two hundred forty-three".