163118729 has 2 divisors, whose sum is σ = 163118730. Its totient is φ = 163118728.

The previous prime is 163118693. The next prime is 163118749. The reversal of 163118729 is 927811361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143520400 + 19598329 = 11980^2 + 4427^2 .

It is an emirp because it is prime and its reverse (927811361) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163118729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 163118692 and 163118701.

It is not a weakly prime, because it can be changed into another prime (163118749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81559364 + 81559365.

It is an arithmetic number, because the mean of its divisors is an integer number (81559365).

Almost surely, 2^163118729 is an apocalyptic number.

It is an amenable number.

163118729 is a deficient number, since it is larger than the sum of its proper divisors (1).

163118729 is an equidigital number, since it uses as much as digits as its factorization.

163118729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 38.

The square root of 163118729 is about 12771.7942748856. The cubic root of 163118729 is about 546.3881555644.

The spelling of 163118729 in words is "one hundred sixty-three million, one hundred eighteen thousand, seven hundred twenty-nine".