129128497 has 8 divisors (see below), whose sum is σ = 131432576. Its totient is φ = 126835632.

The previous prime is 129128491. The next prime is 129128507. The reversal of 129128497 is 794821921.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 129128497 - 2⁷ = 129128369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129128491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22408 + ... + 27574.

It is an arithmetic number, because the mean of its divisors is an integer number (16429072).

Almost surely, 2^129128497 is an apocalyptic number.

It is an amenable number.

129128497 is a deficient number, since it is larger than the sum of its proper divisors (2304079).

129128497 is an equidigital number, since it uses as much as digits as its factorization.

129128497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5607.

The product of its digits is 72576, while the sum is 43.

The square root of 129128497 is about 11363.4720486302. The cubic root of 129128497 is about 505.4451481282.

The spelling of 129128497 in words is "one hundred twenty-nine million, one hundred twenty-eight thousand, four hundred ninety-seven".