8129 has 4 divisors (see below), whose sum is σ = 8880. Its totient is φ = 7380.

The previous prime is 8123. The next prime is 8147. The reversal of 8129 is 9218.

8129 = 22² + 23² + ... + 32².

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 a cyclic number.

It is not a de Polignac number, because 8129 - 2⁸ = 7873 is a prime.

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

It is a pancake number, because a pancake can be divided into 8129 parts by 127 straight cuts.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8129.

It is not an unprimeable number, because it can be changed into a prime (8123) 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, 359 + ... + 380.

It is an arithmetic number, because the mean of its divisors is an integer number (2220).

2⁸¹²⁹ is an apocalyptic number.

It is an amenable number.

8129 is a deficient number, since it is larger than the sum of its proper divisors (751).

8129 is a wasteful number, since it uses less digits than its factorization.

8129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750.

The product of its digits is 144, while the sum is 20.

The square root of 8129 is about 90.1609671643. The cubic root of 8129 is about 20.1069273087.

Subtracting 8129 from its reverse (9218), we obtain a square (1089 = 33²).

The spelling of 8129 in words is "eight thousand, one hundred twenty-nine".