171620161 has 2 divisors, whose sum is σ = 171620162. Its totient is φ = 171620160.

The previous prime is 171620149. The next prime is 171620191. The reversal of 171620161 is 161026171.

It is a happy number.

171620161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102414400 + 69205761 = 10120^2 + 8319^2 .

It is an emirp because it is prime and its reverse (161026171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171620161 - 2⁵ = 171620129 is a prime.

It is not a weakly prime, because it can be changed into another prime (171620101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85810080 + 85810081.

It is an arithmetic number, because the mean of its divisors is an integer number (85810081).

Almost surely, 2^171620161 is an apocalyptic number.

It is an amenable number.

171620161 is a deficient number, since it is larger than the sum of its proper divisors (1).

171620161 is an equidigital number, since it uses as much as digits as its factorization.

171620161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 171620161 is about 13100.3878186869. The cubic root of 171620161 is about 555.7200955134.

The spelling of 171620161 in words is "one hundred seventy-one million, six hundred twenty thousand, one hundred sixty-one".