163121 has 6 divisors (see below), whose sum is σ = 189810. Its totient is φ = 139776.

The previous prime is 163117. The next prime is 163127. The reversal of 163121 is 121361.

It can be written as a sum of positive squares in only one way, i.e., 132496 + 30625 = 364^2 + 175^2 .

It is not a de Polignac number, because 163121 - 2² = 163117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163096 and 163105.

It is not an unprimeable number, because it can be changed into a prime (163127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1616 + ... + 1713.

It is an arithmetic number, because the mean of its divisors is an integer number (31635).

2¹⁶³¹²¹ is an apocalyptic number.

It is an amenable number.

163121 is a deficient number, since it is larger than the sum of its proper divisors (26689).

163121 is an equidigital number, since it uses as much as digits as its factorization.

163121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3343 (or 3336 counting only the distinct ones).

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

The square root of 163121 is about 403.8824086290. The cubic root of 163121 is about 54.6390691226.

Adding to 163121 its reverse (121361), we get a palindrome (284482).

The spelling of 163121 in words is "one hundred sixty-three thousand, one hundred twenty-one".