68799139 has 2 divisors, whose sum is σ = 68799140. Its totient is φ = 68799138.

The previous prime is 68799131. The next prime is 68799161. The reversal of 68799139 is 93199786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68799139 - 2³ = 68799131 is a prime.

It is not a weakly prime, because it can be changed into another prime (68799131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34399569 + 34399570.

It is an arithmetic number, because the mean of its divisors is an integer number (34399570).

Almost surely, 2^68799139 is an apocalyptic number.

68799139 is a deficient number, since it is larger than the sum of its proper divisors (1).

68799139 is an equidigital number, since it uses as much as digits as its factorization.

68799139 is an evil number, because the sum of its binary digits is even.

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

The square root of 68799139 is about 8294.5246397850. The cubic root of 68799139 is about 409.7582135782.

The spelling of 68799139 in words is "sixty-eight million, seven hundred ninety-nine thousand, one hundred thirty-nine".