161189 has 4 divisors (see below), whose sum is σ = 184224. Its totient is φ = 138156.

The previous prime is 161167. The next prime is 161201. The reversal of 161189 is 981161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 981161 = 283 ⋅3467.

It is a cyclic number.

It is not a de Polignac number, because 161189 - 2⁸ = 160933 is a prime.

It is a Duffinian number.

161189 is a modest number, since divided by 189 gives 161 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11507 + ... + 11520.

It is an arithmetic number, because the mean of its divisors is an integer number (46056).

2¹⁶¹¹⁸⁹ is an apocalyptic number.

It is an amenable number.

161189 is a deficient number, since it is larger than the sum of its proper divisors (23035).

161189 is an equidigital number, since it uses as much as digits as its factorization.

161189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23034.

The product of its digits is 432, while the sum is 26.

The square root of 161189 is about 401.4834990383. The cubic root of 161189 is about 54.4224973629.

Multiplying 161189 by its sum of digits (26), we get a palindrome (4190914).

The spelling of 161189 in words is "one hundred sixty-one thousand, one hundred eighty-nine".