161583 has 4 divisors (see below), whose sum is σ = 215448. Its totient is φ = 107720.

The previous prime is 161573. The next prime is 161591. The reversal of 161583 is 385161.

161583 is nontrivially palindromic in base 15.

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 161583 - 2⁹ = 161071 is a prime.

It is a super-2 number, since 2×161583² = 52218131778, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161503) 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, 26928 + ... + 26933.

It is an arithmetic number, because the mean of its divisors is an integer number (53862).

2¹⁶¹⁵⁸³ is an apocalyptic number.

161583 is a deficient number, since it is larger than the sum of its proper divisors (53865).

161583 is an equidigital number, since it uses as much as digits as its factorization.

161583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53864.

The product of its digits is 720, while the sum is 24.

The square root of 161583 is about 401.9738797484. The cubic root of 161583 is about 54.4668035641.

It can be divided in two parts, 16158 and 3, that added together give a palindrome (16161).

The spelling of 161583 in words is "one hundred sixty-one thousand, five hundred eighty-three".