129231005 has 8 divisors (see below), whose sum is σ = 157261824. Its totient is φ = 101928400.

The previous prime is 129230987. The next prime is 129231023. The reversal of 129231005 is 500132921.

It is an interprime number because it is at equal distance from previous prime (129230987) and next prime (129231023).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129231005 - 2¹⁰ = 129229981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181661 + ... + 182370.

It is an arithmetic number, because the mean of its divisors is an integer number (19657728).

Almost surely, 2^129231005 is an apocalyptic number.

It is an amenable number.

129231005 is a deficient number, since it is larger than the sum of its proper divisors (28030819).

129231005 is an equidigital number, since it uses as much as digits as its factorization.

129231005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364107.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 129231005 is about 11367.9815710618. The cubic root of 129231005 is about 505.5788611046.

Adding to 129231005 its reverse (500132921), we get a palindrome (629363926).

The spelling of 129231005 in words is "one hundred twenty-nine million, two hundred thirty-one thousand, five".