161565171 has 8 divisors (see below), whose sum is σ = 217841040. Its totient is φ = 106499712.

The previous prime is 161565169. The next prime is 161565203. The reversal of 161565171 is 171565161.

161565171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161565171 - 2¹ = 161565169 is a prime.

It is a super-2 number, since 2×161565171² = 52206608960518482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161565101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302290 + ... + 302823.

It is an arithmetic number, because the mean of its divisors is an integer number (27230130).

Almost surely, 2^161565171 is an apocalyptic number.

161565171 is a deficient number, since it is larger than the sum of its proper divisors (56275869).

161565171 is an equidigital number, since it uses as much as digits as its factorization.

161565171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605205.

The product of its digits is 6300, while the sum is 33.

The square root of 161565171 is about 12710.8288872127. The cubic root of 161565171 is about 544.6480020907.

The spelling of 161565171 in words is "one hundred sixty-one million, five hundred sixty-five thousand, one hundred seventy-one".