161423 has 4 divisors (see below), whose sum is σ = 162240. Its totient is φ = 160608.

The previous prime is 161411. The next prime is 161453. The reversal of 161423 is 324161.

It is a semiprime because it is the product of two primes, 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 161423 - 2⁴ = 161407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161453) 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, 98 + ... + 576.

It is an arithmetic number, because the mean of its divisors is an integer number (40560).

2¹⁶¹⁴²³ is an apocalyptic number.

161423 is a deficient number, since it is larger than the sum of its proper divisors (817).

161423 is an equidigital number, since it uses as much as digits as its factorization.

161423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816.

The product of its digits is 144, while the sum is 17.

The square root of 161423 is about 401.7748125505. The cubic root of 161423 is about 54.4488198930.

Adding to 161423 its reverse (324161), we get a palindrome (485584).

The spelling of 161423 in words is "one hundred sixty-one thousand, four hundred twenty-three".