161559583 has 4 divisors (see below), whose sum is σ = 163506168. Its totient is φ = 159613000.

The previous prime is 161559571. The next prime is 161559589. The reversal of 161559583 is 385955161.

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

It is a cyclic number.

It is not a de Polignac number, because 161559583 - 2²⁵ = 128005151 is a prime.

It is a super-2 number, since 2×161559583² = 52202997718267778, 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 (161559589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 973168 + ... + 973333.

It is an arithmetic number, because the mean of its divisors is an integer number (40876542).

Almost surely, 2^161559583 is an apocalyptic number.

161559583 is a deficient number, since it is larger than the sum of its proper divisors (1946585).

161559583 is an equidigital number, since it uses as much as digits as its factorization.

161559583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946584.

The product of its digits is 162000, while the sum is 43.

The square root of 161559583 is about 12710.6090727392. The cubic root of 161559583 is about 544.6417228328.

The spelling of 161559583 in words is "one hundred sixty-one million, five hundred fifty-nine thousand, five hundred eighty-three".