68351209 has 4 divisors (see below), whose sum is σ = 69940816. Its totient is φ = 66761604.

The previous prime is 68351201. The next prime is 68351219. The reversal of 68351209 is 90215386.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90215386 = 2 ⋅45107693.

It is a cyclic number.

It is not a de Polignac number, because 68351209 - 2³ = 68351201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68351201) 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 in 3 ways as a sum of consecutive naturals, for example, 794739 + ... + 794824.

It is an arithmetic number, because the mean of its divisors is an integer number (17485204).

Almost surely, 2^68351209 is an apocalyptic number.

It is an amenable number.

68351209 is a deficient number, since it is larger than the sum of its proper divisors (1589607).

68351209 is a wasteful number, since it uses less digits than its factorization.

68351209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1589606.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 68351209 is about 8267.4789990662. The cubic root of 68351209 is about 408.8670068132.

The spelling of 68351209 in words is "sixty-eight million, three hundred fifty-one thousand, two hundred nine".