129198135 has 16 divisors (see below), whose sum is σ = 225509760. Its totient is φ = 62641440.

The previous prime is 129198133. The next prime is 129198143. The reversal of 129198135 is 531891921.

It is not a de Polignac number, because 129198135 - 2¹ = 129198133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129198093 and 129198102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129198131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391345 + ... + 391674.

It is an arithmetic number, because the mean of its divisors is an integer number (14094360).

Almost surely, 2^129198135 is an apocalyptic number.

129198135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129198135 is a deficient number, since it is larger than the sum of its proper divisors (96311625).

129198135 is a wasteful number, since it uses less digits than its factorization.

129198135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783038.

The product of its digits is 19440, while the sum is 39.

The square root of 129198135 is about 11366.5357519343. The cubic root of 129198135 is about 505.5359926863.

The spelling of 129198135 in words is "one hundred twenty-nine million, one hundred ninety-eight thousand, one hundred thirty-five".