163729 has 2 divisors, whose sum is σ = 163730. Its totient is φ = 163728.

The previous prime is 163697. The next prime is 163733. The reversal of 163729 is 927361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140625 + 23104 = 375^2 + 152^2 .

It is an emirp because it is prime and its reverse (927361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163729 - 2⁵ = 163697 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 163697 and 163706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163789) 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, 81864 + 81865.

It is an arithmetic number, because the mean of its divisors is an integer number (81865).

2¹⁶³⁷²⁹ is an apocalyptic number.

It is an amenable number.

163729 is a deficient number, since it is larger than the sum of its proper divisors (1).

163729 is an equidigital number, since it uses as much as digits as its factorization.

163729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 28.

The square root of 163729 is about 404.6344028873. The cubic root of 163729 is about 54.7068702539.

The spelling of 163729 in words is "one hundred sixty-three thousand, seven hundred twenty-nine".