68847731 has 2 divisors, whose sum is σ = 68847732. Its totient is φ = 68847730.

The previous prime is 68847721. The next prime is 68847767. The reversal of 68847731 is 13774886.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68847731 is a prime.

It is a super-2 number, since 2×68847731² = 9480020127696722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68847721) 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, 34423865 + 34423866.

It is an arithmetic number, because the mean of its divisors is an integer number (34423866).

Almost surely, 2^68847731 is an apocalyptic number.

68847731 is a deficient number, since it is larger than the sum of its proper divisors (1).

68847731 is an equidigital number, since it uses as much as digits as its factorization.

68847731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 44.

The square root of 68847731 is about 8297.4532839902. The cubic root of 68847731 is about 409.8546599661.

The spelling of 68847731 in words is "sixty-eight million, eight hundred forty-seven thousand, seven hundred thirty-one".