129271099281 has 8 divisors (see below), whose sum is σ = 176565404064. Its totient is φ = 84078763680.

The previous prime is 129271099267. The next prime is 129271099283. The reversal of 129271099281 is 182990172921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129271099281 - 2²⁹ = 128734228369 is a prime.

It is a super-2 number, since 2×129271099281² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (129271099283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525492151 + ... + 525492396.

It is an arithmetic number, because the mean of its divisors is an integer number (22070675508).

Almost surely, 2^129271099281 is an apocalyptic number.

It is an amenable number.

129271099281 is a deficient number, since it is larger than the sum of its proper divisors (47294304783).

129271099281 is a wasteful number, since it uses less digits than its factorization.

129271099281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050984591.

The product of its (nonzero) digits is 326592, while the sum is 51.

The spelling of 129271099281 in words is "one hundred twenty-nine billion, two hundred seventy-one million, ninety-nine thousand, two hundred eighty-one".