68931839 has 2 divisors, whose sum is σ = 68931840. Its totient is φ = 68931838.

The previous prime is 68931833. The next prime is 68931893. The reversal of 68931839 is 93813986.

Together with next prime (68931893) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68931839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68931793 and 68931802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68931833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34465919 + 34465920.

It is an arithmetic number, because the mean of its divisors is an integer number (34465920).

Almost surely, 2^68931839 is an apocalyptic number.

68931839 is a deficient number, since it is larger than the sum of its proper divisors (1).

68931839 is an equidigital number, since it uses as much as digits as its factorization.

68931839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 68931839 is about 8302.5200391207. The cubic root of 68931839 is about 410.0214920322.

The spelling of 68931839 in words is "sixty-eight million, nine hundred thirty-one thousand, eight hundred thirty-nine".