68434139 has 2 divisors, whose sum is σ = 68434140. Its totient is φ = 68434138.

The previous prime is 68434117. The next prime is 68434141. The reversal of 68434139 is 93143486.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68434139 is a prime.

Together with 68434141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68434189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34217069 + 34217070.

It is an arithmetic number, because the mean of its divisors is an integer number (34217070).

Almost surely, 2^68434139 is an apocalyptic number.

68434139 is a deficient number, since it is larger than the sum of its proper divisors (1).

68434139 is an equidigital number, since it uses as much as digits as its factorization.

68434139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 38.

The square root of 68434139 is about 8272.4929132638. The cubic root of 68434139 is about 409.0322983881.

The spelling of 68434139 in words is "sixty-eight million, four hundred thirty-four thousand, one hundred thirty-nine".