161243 has 4 divisors (see below), whose sum is σ = 162048. Its totient is φ = 160440.

The previous prime is 161237. The next prime is 161263. The reversal of 161243 is 342161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 342161 = 577 ⋅593.

It is a cyclic number.

It is not a de Polignac number, because 161243 - 2¹⁶ = 95707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161233) 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, 173 + ... + 593.

It is an arithmetic number, because the mean of its divisors is an integer number (40512).

2¹⁶¹²⁴³ is an apocalyptic number.

161243 is a deficient number, since it is larger than the sum of its proper divisors (805).

161243 is an equidigital number, since it uses as much as digits as its factorization.

161243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804.

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

The square root of 161243 is about 401.5507439913. The cubic root of 161243 is about 54.4285740529.

It can be divided in two parts, 161 and 243, that added together give a palindrome (404).

The spelling of 161243 in words is "one hundred sixty-one thousand, two hundred forty-three".