2129 has 2 divisors, whose sum is σ = 2130. Its totient is φ = 2128.

The previous prime is 2113. The next prime is 2131. The reversal of 2129 is 9212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1600 + 529 = 40^2 + 23^2 .

It is a cyclic number.

It is not a de Polignac number, because 2129 - 2⁴ = 2113 is a prime.

It is a Sophie Germain prime.

Together with 2131, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a plaindrome in base 11.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (2179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064 + 1065.

It is an arithmetic number, because the mean of its divisors is an integer number (1065).

It is an amenable number.

2129 is a deficient number, since it is larger than the sum of its proper divisors (1).

2129 is an equidigital number, since it uses as much as digits as its factorization.

2129 is an evil number, because the sum of its binary digits is even.

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

The square root of 2129 is about 46.1410879802. The cubic root of 2129 is about 12.8644696629.

It can be divided in two parts, 2 and 129, that added together give a palindrome (131).

The spelling of 2129 in words is "two thousand, one hundred twenty-nine".