161593 has 4 divisors (see below), whose sum is σ = 162448. Its totient is φ = 160740.

The previous prime is 161591. The next prime is 161599. The reversal of 161593 is 395161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 161593 - 2¹ = 161591 is a prime.

It is a super-2 number, since 2×161593² = 52224595298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161591) 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 3 ways as a sum of consecutive naturals, for example, 3 + ... + 568.

It is an arithmetic number, because the mean of its divisors is an integer number (40612).

2¹⁶¹⁵⁹³ is an apocalyptic number.

It is an amenable number.

161593 is a deficient number, since it is larger than the sum of its proper divisors (855).

161593 is an equidigital number, since it uses as much as digits as its factorization.

161593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854.

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

The square root of 161593 is about 401.9863181751. The cubic root of 161593 is about 54.4679271493.

The spelling of 161593 in words is "one hundred sixty-one thousand, five hundred ninety-three".