129087831 has 8 divisors (see below), whose sum is σ = 172188784. Its totient is φ = 86022720.

The previous prime is 129087809. The next prime is 129087841. The reversal of 129087831 is 138780921.

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

It is not a de Polignac number, because 129087831 - 2¹⁰ = 129086807 is a prime.

It is a super-2 number, since 2×129087831² = 33327336224569122, which contains 22 as substring.

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 129087831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129087841) by changing a digit.

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, 1041 + ... + 16101.

It is an arithmetic number, because the mean of its divisors is an integer number (21523598).

Almost surely, 2^129087831 is an apocalyptic number.

129087831 is a deficient number, since it is larger than the sum of its proper divisors (43100953).

129087831 is a wasteful number, since it uses less digits than its factorization.

129087831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17921.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 129087831 is about 11361.6825778579. The cubic root of 129087831 is about 505.3920831813.

The spelling of 129087831 in words is "one hundred twenty-nine million, eighty-seven thousand, eight hundred thirty-one".