129331 has 4 divisors (see below), whose sum is σ = 130072. Its totient is φ = 128592.

The previous prime is 129313. The next prime is 129341. The reversal of 129331 is 133921.

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: 133921 = 157 ⋅853.

It is a cyclic number.

It is not a de Polignac number, because 129331 - 2⁹ = 128819 is a prime.

It is a super-2 number, since 2×129331² = 33453015122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129299 and 129308.

It is not an unprimeable number, because it can be changed into a prime (129341) 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, 55 + ... + 511.

It is an arithmetic number, because the mean of its divisors is an integer number (32518).

2¹²⁹³³¹ is an apocalyptic number.

129331 is a deficient number, since it is larger than the sum of its proper divisors (741).

129331 is an equidigital number, since it uses as much as digits as its factorization.

129331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740.

The product of its digits is 162, while the sum is 19.

The square root of 129331 is about 359.6261948190. The cubic root of 129331 is about 50.5709227973.

The spelling of 129331 in words is "one hundred twenty-nine thousand, three hundred thirty-one".