68739919 has 2 divisors, whose sum is σ = 68739920. Its totient is φ = 68739918.

The previous prime is 68739917. The next prime is 68739949. The reversal of 68739919 is 91993786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68739919 - 2¹ = 68739917 is a prime.

It is a super-2 number, since 2×68739919² = 9450352928253122, which contains 22 as substring.

Together with 68739917, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68739911) 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, 34369959 + 34369960.

It is an arithmetic number, because the mean of its divisors is an integer number (34369960).

Almost surely, 2^68739919 is an apocalyptic number.

68739919 is a deficient number, since it is larger than the sum of its proper divisors (1).

68739919 is an equidigital number, since it uses as much as digits as its factorization.

68739919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 52.

The square root of 68739919 is about 8290.9540464292. The cubic root of 68739919 is about 409.6406111028.

The spelling of 68739919 in words is "sixty-eight million, seven hundred thirty-nine thousand, nine hundred nineteen".