161589 has 8 divisors (see below), whose sum is σ = 219232. Its totient is φ = 105840.

The previous prime is 161573. The next prime is 161591. The reversal of 161589 is 985161.

It is a happy number.

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

It is not a de Polignac number, because 161589 - 2⁴ = 161573 is a prime.

It is a super-2 number, since 2×161589² = 52222009842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259 + ... + 624.

It is an arithmetic number, because the mean of its divisors is an integer number (27404).

2¹⁶¹⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

161589 is a deficient number, since it is larger than the sum of its proper divisors (57643).

161589 is an equidigital number, since it uses as much as digits as its factorization.

161589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947.

The product of its digits is 2160, while the sum is 30.

The square root of 161589 is about 401.9813428506. The cubic root of 161589 is about 54.4674777208.

The spelling of 161589 in words is "one hundred sixty-one thousand, five hundred eighty-nine".