129884831 has 4 divisors (see below), whose sum is σ = 130344072. Its totient is φ = 129425592.

The previous prime is 129884813. The next prime is 129884851. The reversal of 129884831 is 138488921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129884831 - 2²⁶ = 62775967 is a prime.

It is a super-2 number, since 2×129884831² = 33740138647797122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129884801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229196 + ... + 229761.

It is an arithmetic number, because the mean of its divisors is an integer number (32586018).

Almost surely, 2^129884831 is an apocalyptic number.

129884831 is a deficient number, since it is larger than the sum of its proper divisors (459241).

129884831 is an equidigital number, since it uses as much as digits as its factorization.

129884831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459240.

The product of its digits is 110592, while the sum is 44.

The square root of 129884831 is about 11396.7026371666. The cubic root of 129884831 is about 506.4300621282.

The spelling of 129884831 in words is "one hundred twenty-nine million, eight hundred eighty-four thousand, eight hundred thirty-one".