123161 has 4 divisors (see below), whose sum is σ = 124800. Its totient is φ = 121524.

The previous prime is 123143. The next prime is 123169. The reversal of 123161 is 161321.

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 an emirpimes, since its reverse is a distinct semiprime: 161321 = 353 ⋅457.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123169) 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, 701 + ... + 858.

It is an arithmetic number, because the mean of its divisors is an integer number (31200).

2¹²³¹⁶¹ is an apocalyptic number.

It is an amenable number.

123161 is a deficient number, since it is larger than the sum of its proper divisors (1639).

123161 is an equidigital number, since it uses as much as digits as its factorization.

123161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638.

The product of its digits is 36, while the sum is 14.

The square root of 123161 is about 350.9430153173. The cubic root of 123161 is about 49.7535876136.

Adding to 123161 its reverse (161321), we get a palindrome (284482).

The spelling of 123161 in words is "one hundred twenty-three thousand, one hundred sixty-one".