129216775 has 12 divisors (see below), whose sum is σ = 161702200. Its totient is φ = 102422880.

The previous prime is 129216757. The next prime is 129216797. The reversal of 129216775 is 577612921.

It is a de Polignac number, because none of the positive numbers 2^k-129216775 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20985 + ... + 26434.

Almost surely, 2^129216775 is an apocalyptic number.

129216775 is a deficient number, since it is larger than the sum of its proper divisors (32485425).

129216775 is a wasteful number, since it uses less digits than its factorization.

129216775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47538 (or 47533 counting only the distinct ones).

The product of its digits is 52920, while the sum is 40.

The square root of 129216775 is about 11367.3556731546. The cubic root of 129216775 is about 505.5603035062.

The spelling of 129216775 in words is "one hundred twenty-nine million, two hundred sixteen thousand, seven hundred seventy-five".