168863729 has 2 divisors, whose sum is σ = 168863730. Its totient is φ = 168863728.

The previous prime is 168863699. The next prime is 168863741. The reversal of 168863729 is 927368861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105103504 + 63760225 = 10252^2 + 7985^2 .

It is an emirp because it is prime and its reverse (927368861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168863729 - 2¹² = 168859633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (168863759) 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, 84431864 + 84431865.

It is an arithmetic number, because the mean of its divisors is an integer number (84431865).

Almost surely, 2^168863729 is an apocalyptic number.

It is an amenable number.

168863729 is a deficient number, since it is larger than the sum of its proper divisors (1).

168863729 is an equidigital number, since it uses as much as digits as its factorization.

168863729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 50.

The square root of 168863729 is about 12994.7577507239. The cubic root of 168863729 is about 552.7288395011.

The spelling of 168863729 in words is "one hundred sixty-eight million, eight hundred sixty-three thousand, seven hundred twenty-nine".