68632139 has 2 divisors, whose sum is σ = 68632140. Its totient is φ = 68632138.

The previous prime is 68632133. The next prime is 68632141. The reversal of 68632139 is 93123686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68632139 - 2⁸ = 68631883 is a prime.

Together with 68632141, 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 (68632133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34316069 + 34316070.

It is an arithmetic number, because the mean of its divisors is an integer number (34316070).

Almost surely, 2^68632139 is an apocalyptic number.

68632139 is a deficient number, since it is larger than the sum of its proper divisors (1).

68632139 is an equidigital number, since it uses as much as digits as its factorization.

68632139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 38.

The square root of 68632139 is about 8284.4516414788. The cubic root of 68632139 is about 409.4264019445.

The spelling of 68632139 in words is "sixty-eight million, six hundred thirty-two thousand, one hundred thirty-nine".