129631 has 2 divisors, whose sum is σ = 129632. Its totient is φ = 129630.

The previous prime is 129629. The next prime is 129641. The reversal of 129631 is 136921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129631 - 2¹ = 129629 is a prime.

It is a super-2 number, since 2×129631² = 33608392322, which contains 22 as substring.

Together with 129629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64815 + 64816.

It is an arithmetic number, because the mean of its divisors is an integer number (64816).

2¹²⁹⁶³¹ is an apocalyptic number.

129631 is a deficient number, since it is larger than the sum of its proper divisors (1).

129631 is an equidigital number, since it uses as much as digits as its factorization.

129631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 22.

The square root of 129631 is about 360.0430529812. The cubic root of 129631 is about 50.6099945367.

The spelling of 129631 in words is "one hundred twenty-nine thousand, six hundred thirty-one".