121129 has 4 divisors (see below), whose sum is σ = 122580. Its totient is φ = 119680.

The previous prime is 121123. The next prime is 121139. The reversal of 121129 is 921121.

121129 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21904 + 99225 = 148^2 + 315^2 .

It is a cyclic number.

It is not a de Polignac number, because 121129 - 2⁷ = 121001 is a prime.

It is a Duffinian number.

121129 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121123) 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, 592 + ... + 769.

It is an arithmetic number, because the mean of its divisors is an integer number (30645).

2¹²¹¹²⁹ is an apocalyptic number.

It is an amenable number.

121129 is a deficient number, since it is larger than the sum of its proper divisors (1451).

121129 is an equidigital number, since it uses as much as digits as its factorization.

121129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450.

The product of its digits is 36, while the sum is 16.

The square root of 121129 is about 348.0359176867. The cubic root of 121129 is about 49.4784451948.

It can be divided in two parts, 12112 and 9, that added together give a palindrome (12121).

The spelling of 121129 in words is "one hundred twenty-one thousand, one hundred twenty-nine".