168723161 has 2 divisors, whose sum is σ = 168723162. Its totient is φ = 168723160.

The previous prime is 168723157. The next prime is 168723169. The reversal of 168723161 is 161327861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167832025 + 891136 = 12955^2 + 944^2 .

It is an emirp because it is prime and its reverse (161327861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168723161 - 2² = 168723157 is a prime.

It is not a weakly prime, because it can be changed into another prime (168723169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84361580 + 84361581.

It is an arithmetic number, because the mean of its divisors is an integer number (84361581).

Almost surely, 2^168723161 is an apocalyptic number.

It is an amenable number.

168723161 is a deficient number, since it is larger than the sum of its proper divisors (1).

168723161 is an equidigital number, since it uses as much as digits as its factorization.

168723161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 168723161 is about 12989.3479820967. The cubic root of 168723161 is about 552.5754267327.

The spelling of 168723161 in words is "one hundred sixty-eight million, seven hundred twenty-three thousand, one hundred sixty-one".