171605161 has 16 divisors (see below), whose sum is σ = 213308928. Its totient is φ = 134424000.

The previous prime is 171605141. The next prime is 171605219. The reversal of 171605161 is 161506171.

It is a cyclic number.

It is not a de Polignac number, because 171605161 - 2⁹ = 171604649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (171605111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145 + ... + 18526.

It is an arithmetic number, because the mean of its divisors is an integer number (13331808).

Almost surely, 2^171605161 is an apocalyptic number.

It is an amenable number.

171605161 is a deficient number, since it is larger than the sum of its proper divisors (41703767).

171605161 is a wasteful number, since it uses less digits than its factorization.

171605161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18792.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 171605161 is about 13099.8153040415. The cubic root of 171605161 is about 555.7039046334.

The spelling of 171605161 in words is "one hundred seventy-one million, six hundred five thousand, one hundred sixty-one".