129431087 has 4 divisors (see below), whose sum is σ = 130001496. Its totient is φ = 128860680.

The previous prime is 129431063. The next prime is 129431123. The reversal of 129431087 is 780134921.

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 129431087 - 2¹² = 129426991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129421087) 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, 284864 + ... + 285317.

It is an arithmetic number, because the mean of its divisors is an integer number (32500374).

Almost surely, 2^129431087 is an apocalyptic number.

129431087 is a deficient number, since it is larger than the sum of its proper divisors (570409).

129431087 is an equidigital number, since it uses as much as digits as its factorization.

129431087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570408.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 129431087 is about 11376.7784104289. The cubic root of 129431087 is about 505.8396475130.

The spelling of 129431087 in words is "one hundred twenty-nine million, four hundred thirty-one thousand, eighty-seven".