161023 has 4 divisors (see below), whose sum is σ = 168048. Its totient is φ = 154000.

The previous prime is 161017. The next prime is 161033. The reversal of 161023 is 320161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161023 is a prime.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 160994 and 161012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161033) 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, 3478 + ... + 3523.

It is an arithmetic number, because the mean of its divisors is an integer number (42012).

2¹⁶¹⁰²³ is an apocalyptic number.

161023 is a deficient number, since it is larger than the sum of its proper divisors (7025).

161023 is an equidigital number, since it uses as much as digits as its factorization.

161023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7024.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 161023 is about 401.2767125065. The cubic root of 161023 is about 54.4038086650.

Adding to 161023 its reverse (320161), we get a palindrome (481184).

The spelling of 161023 in words is "one hundred sixty-one thousand, twenty-three".