129191216 has 60 divisors (see below), whose sum is σ = 314469456. Its totient is φ = 50328960.

The previous prime is 129191213. The next prime is 129191261. The reversal of 129191216 is 612191921.

It is not an unprimeable number, because it can be changed into a prime (129191213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8786 + ... + 18318.

Almost surely, 2^129191216 is an apocalyptic number.

129191216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129191216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157234728).

129191216 is an abundant number, since it is smaller than the sum of its proper divisors (185278240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129191216 is a wasteful number, since it uses less digits than its factorization.

129191216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9570 (or 9553 counting only the distinct ones).

The product of its digits is 1944, while the sum is 32.

The square root of 129191216 is about 11366.2313895152. The cubic root of 129191216 is about 505.5269681340.

The spelling of 129191216 in words is "one hundred twenty-nine million, one hundred ninety-one thousand, two hundred sixteen".