161089 has 4 divisors (see below), whose sum is σ = 165060. Its totient is φ = 157120.

The previous prime is 161087. The next prime is 161093. The reversal of 161089 is 980161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14400 + 146689 = 120^2 + 383^2 .

It is a cyclic number.

It is not a de Polignac number, because 161089 - 2¹ = 161087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161087) 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, 1924 + ... + 2005.

It is an arithmetic number, because the mean of its divisors is an integer number (41265).

2¹⁶¹⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

161089 is a deficient number, since it is larger than the sum of its proper divisors (3971).

161089 is an equidigital number, since it uses as much as digits as its factorization.

161089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3970.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 161089 is about 401.3589415972. The cubic root of 161089 is about 54.4112406486.

It can be divided in two parts, 16 and 1089, that multiplied together give a square (17424 = 132²).

The spelling of 161089 in words is "one hundred sixty-one thousand, eighty-nine".