121165 has 8 divisors (see below), whose sum is σ = 158688. Its totient is φ = 88080.

The previous prime is 121157. The next prime is 121169. The reversal of 121165 is 561121.

It is a happy number.

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

It is not a de Polignac number, because 121165 - 2³ = 121157 is a prime.

It is a Duffinian number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 1047 + ... + 1156.

It is an arithmetic number, because the mean of its divisors is an integer number (19836).

2¹²¹¹⁶⁵ is an apocalyptic number.

It is an amenable number.

121165 is a deficient number, since it is larger than the sum of its proper divisors (37523).

121165 is a wasteful number, since it uses less digits than its factorization.

121165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2219.

The product of its digits is 60, while the sum is 16.

The square root of 121165 is about 348.0876326444. The cubic root of 121165 is about 49.4833464367.

Adding to 121165 its reverse (561121), we get a palindrome (682286).

It can be divided in two parts, 12116 and 5, that added together give a palindrome (12121).

The spelling of 121165 in words is "one hundred twenty-one thousand, one hundred sixty-five".