121161 has 4 divisors (see below), whose sum is σ = 161552. Its totient is φ = 80772.

The previous prime is 121157. The next prime is 121169. The reversal of 121161 is 161121.

It is a happy number.

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.

It is not a de Polignac number, because 121161 - 2² = 121157 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121169) 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, 20191 + ... + 20196.

It is an arithmetic number, because the mean of its divisors is an integer number (40388).

2¹²¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

121161 is a deficient number, since it is larger than the sum of its proper divisors (40391).

121161 is an equidigital number, since it uses as much as digits as its factorization.

121161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40390.

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

The square root of 121161 is about 348.0818869174. The cubic root of 121161 is about 49.4828019022.

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

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

The spelling of 121161 in words is "one hundred twenty-one thousand, one hundred sixty-one".