129128495 has 8 divisors (see below), whose sum is σ = 156821616. Its totient is φ = 102057856.

The previous prime is 129128491. The next prime is 129128507. The reversal of 129128495 is 594821921.

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 129128495 - 2² = 129128491 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129128491) 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, 155162 + ... + 155991.

It is an arithmetic number, because the mean of its divisors is an integer number (19602702).

Almost surely, 2^129128495 is an apocalyptic number.

129128495 is a deficient number, since it is larger than the sum of its proper divisors (27693121).

129128495 is an equidigital number, since it uses as much as digits as its factorization.

129128495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311241.

The product of its digits is 51840, while the sum is 41.

The square root of 129128495 is about 11363.4719606289. The cubic root of 129128495 is about 505.4451455186.

The spelling of 129128495 in words is "one hundred twenty-nine million, one hundred twenty-eight thousand, four hundred ninety-five".