161539 has 8 divisors (see below), whose sum is σ = 188928. Its totient is φ = 135240.

The previous prime is 161531. The next prime is 161543. The reversal of 161539 is 935161.

161539 is nontrivially palindromic in base 12.

161539 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 161539 - 2³ = 161531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161531) 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, 84 + ... + 574.

It is an arithmetic number, because the mean of its divisors is an integer number (23616).

2¹⁶¹⁵³⁹ is an apocalyptic number.

161539 is a deficient number, since it is larger than the sum of its proper divisors (27389).

161539 is an equidigital number, since it uses as much as digits as its factorization.

161539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545.

The product of its digits is 810, while the sum is 25.

The square root of 161539 is about 401.9191460978. The cubic root of 161539 is about 54.4618592385.

The spelling of 161539 in words is "one hundred sixty-one thousand, five hundred thirty-nine".