172143129 has 16 divisors (see below), whose sum is σ = 236609280. Its totient is φ = 111242880.

The previous prime is 172143113. The next prime is 172143151. The reversal of 172143129 is 921341271.

It is not a de Polignac number, because 172143129 - 2⁴ = 172143113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172143096 and 172143105.

It is not an unprimeable number, because it can be changed into a prime (172143029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28432 + ... + 33950.

It is an arithmetic number, because the mean of its divisors is an integer number (14788080).

Almost surely, 2^172143129 is an apocalyptic number.

It is an amenable number.

172143129 is a deficient number, since it is larger than the sum of its proper divisors (64466151).

172143129 is a wasteful number, since it uses less digits than its factorization.

172143129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5840.

The product of its digits is 3024, while the sum is 30.

The square root of 172143129 is about 13120.3326558438. The cubic root of 172143129 is about 556.2839941519.

It can be divided in two parts, 1721 and 43129, that added together give a triangular number (44850 = T₂₉₉).

The spelling of 172143129 in words is "one hundred seventy-two million, one hundred forty-three thousand, one hundred twenty-nine".