68039731 has 2 divisors, whose sum is σ = 68039732. Its totient is φ = 68039730.

The previous prime is 68039711. The next prime is 68039737. The reversal of 68039731 is 13793086.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68039731 is a prime.

It is a super-2 number, since 2×68039731² = 9258809989104722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68039737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34019865 + 34019866.

It is an arithmetic number, because the mean of its divisors is an integer number (34019866).

Almost surely, 2^68039731 is an apocalyptic number.

68039731 is a deficient number, since it is larger than the sum of its proper divisors (1).

68039731 is an equidigital number, since it uses as much as digits as its factorization.

68039731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 68039731 is about 8248.6199451787. The cubic root of 68039731 is about 408.2449889492.

The spelling of 68039731 in words is "sixty-eight million, thirty-nine thousand, seven hundred thirty-one".