129181143 has 16 divisors (see below), whose sum is σ = 211990016. Its totient is φ = 68139360.

The previous prime is 129181139. The next prime is 129181153. The reversal of 129181143 is 341181921.

It is not a de Polignac number, because 129181143 - 2² = 129181139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129181143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129181153) 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 15 ways as a sum of consecutive naturals, for example, 236323 + ... + 236868.

It is an arithmetic number, because the mean of its divisors is an integer number (13249376).

Almost surely, 2^129181143 is an apocalyptic number.

129181143 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

129181143 is a deficient number, since it is larger than the sum of its proper divisors (82808873).

129181143 is a wasteful number, since it uses less digits than its factorization.

129181143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473214.

The product of its digits is 1728, while the sum is 30.

The square root of 129181143 is about 11365.7882700673. The cubic root of 129181143 is about 505.5138291976.

The spelling of 129181143 in words is "one hundred twenty-nine million, one hundred eighty-one thousand, one hundred forty-three".