129131 has 4 divisors (see below), whose sum is σ = 130200. Its totient is φ = 128064.

The previous prime is 129127. The next prime is 129169. The reversal of 129131 is 131921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 131921 = 29 ⋅4549.

It is a cyclic number.

It is not a de Polignac number, because 129131 - 2² = 129127 is a prime.

It is a super-2 number, since 2×129131² = 33349630322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326 + ... + 603.

It is an arithmetic number, because the mean of its divisors is an integer number (32550).

2¹²⁹¹³¹ is an apocalyptic number.

129131 is a deficient number, since it is larger than the sum of its proper divisors (1069).

129131 is an equidigital number, since it uses as much as digits as its factorization.

129131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068.

The product of its digits is 54, while the sum is 17.

The square root of 129131 is about 359.3480207264. The cubic root of 129131 is about 50.5448413922.

The spelling of 129131 in words is "one hundred twenty-nine thousand, one hundred thirty-one".