129189 has 4 divisors (see below), whose sum is σ = 172256. Its totient is φ = 86124.

The previous prime is 129187. The next prime is 129193. The reversal of 129189 is 981921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 981921 = 3 ⋅327307.

It is not a de Polignac number, because 129189 - 2¹ = 129187 is a prime.

It is a super-3 number, since 3×129189³ = 6468414833334807, which contains 333 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129187) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21529 + ... + 21534.

It is an arithmetic number, because the mean of its divisors is an integer number (43064).

2¹²⁹¹⁸⁹ is an apocalyptic number.

It is an amenable number.

129189 is a deficient number, since it is larger than the sum of its proper divisors (43067).

129189 is an equidigital number, since it uses as much as digits as its factorization.

129189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43066.

The product of its digits is 1296, while the sum is 30.

The square root of 129189 is about 359.4287133772. The cubic root of 129189 is about 50.5524077705.

The spelling of 129189 in words is "one hundred twenty-nine thousand, one hundred eighty-nine".