161559 has 12 divisors (see below), whose sum is σ = 241800. Its totient is φ = 103824.

The previous prime is 161543. The next prime is 161561. The reversal of 161559 is 955161.

It is not a de Polignac number, because 161559 - 2⁴ = 161543 is a prime.

It is a super-2 number, since 2×161559² = 52202620962, which contains 22 as substring.

It is an Ulam 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 11 ways as a sum of consecutive naturals, for example, 49 + ... + 570.

It is an arithmetic number, because the mean of its divisors is an integer number (20150).

2¹⁶¹⁵⁵⁹ is an apocalyptic number.

161559 is a deficient number, since it is larger than the sum of its proper divisors (80241).

161559 is a wasteful number, since it uses less digits than its factorization.

161559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654 (or 651 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 161559 is about 401.9440259539. The cubic root of 161559 is about 54.4641067705.

The spelling of 161559 in words is "one hundred sixty-one thousand, five hundred fifty-nine".