168938647 has 2 divisors, whose sum is σ = 168938648. Its totient is φ = 168938646.

The previous prime is 168938617. The next prime is 168938663. The reversal of 168938647 is 746839861.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168938647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 168938594 and 168938603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168938617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84469323 + 84469324.

It is an arithmetic number, because the mean of its divisors is an integer number (84469324).

Almost surely, 2^168938647 is an apocalyptic number.

168938647 is a deficient number, since it is larger than the sum of its proper divisors (1).

168938647 is an equidigital number, since it uses as much as digits as its factorization.

168938647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 52.

The square root of 168938647 is about 12997.6400550254. The cubic root of 168938647 is about 552.8105685518.

The spelling of 168938647 in words is "one hundred sixty-eight million, nine hundred thirty-eight thousand, six hundred forty-seven".