161121 has 8 divisors (see below), whose sum is σ = 220000. Its totient is φ = 104832.

The previous prime is 161093. The next prime is 161123. The reversal of 161121 is 121161.

It is a happy number.

161121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161121 - 2¹¹ = 159073 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161097 and 161106.

It is not an unprimeable number, because it can be changed into a prime (161123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 496 + ... + 753.

It is an arithmetic number, because the mean of its divisors is an integer number (27500).

2¹⁶¹¹²¹ is an apocalyptic number.

It is an amenable number.

161121 is a deficient number, since it is larger than the sum of its proper divisors (58879).

161121 is a wasteful number, since it uses less digits than its factorization.

161121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295.

The product of its digits is 12, while the sum is 12.

The square root of 161121 is about 401.3988041836. The cubic root of 161121 is about 54.4148433039.

Adding to 161121 its reverse (121161), we get a palindrome (282282).

It can be divided in two parts, 161 and 121, that added together give a palindrome (282).

The spelling of 161121 in words is "one hundred sixty-one thousand, one hundred twenty-one".