68147939 has 2 divisors, whose sum is σ = 68147940. Its totient is φ = 68147938.

The previous prime is 68147929. The next prime is 68147953. The reversal of 68147939 is 93974186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68147939 - 2²⁰ = 67099363 is a prime.

It is a super-3 number, since 3×68147939³ (a number of 24 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 68147893 and 68147902.

It is not a weakly prime, because it can be changed into another prime (68147929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34073969 + 34073970.

It is an arithmetic number, because the mean of its divisors is an integer number (34073970).

Almost surely, 2^68147939 is an apocalyptic number.

68147939 is a deficient number, since it is larger than the sum of its proper divisors (1).

68147939 is an equidigital number, since it uses as much as digits as its factorization.

68147939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 47.

The square root of 68147939 is about 8255.1764972046. The cubic root of 68147939 is about 408.4612938222.

The spelling of 68147939 in words is "sixty-eight million, one hundred forty-seven thousand, nine hundred thirty-nine".