129193216 has 18 divisors (see below), whose sum is σ = 257882282. Its totient is φ = 64596480.

The previous prime is 129193193. The next prime is 129193223. The reversal of 129193216 is 612391921.

It can be written as a sum of positive squares in only one way, i.e., 121881600 + 7311616 = 11040^2 + 2704^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252075 + ... + 252586.

Almost surely, 2^129193216 is an apocalyptic number.

129193216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129193216 is a deficient number, since it is larger than the sum of its proper divisors (128689066).

129193216 is an frugal number, since it uses more digits than its factorization.

129193216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504677 (or 504663 counting only the distinct ones).

The product of its digits is 5832, while the sum is 34.

The square root of 129193216 is about 11366.3193690834. The cubic root of 129193216 is about 505.5295767962.

The spelling of 129193216 in words is "one hundred twenty-nine million, one hundred ninety-three thousand, two hundred sixteen".