128516129 has 4 divisors (see below), whose sum is σ = 146875584. Its totient is φ = 110156676.

The previous prime is 128516119. The next prime is 128516153. The reversal of 128516129 is 921615821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 921615821 = 7 ⋅131659403.

It is not a de Polignac number, because 128516129 - 2⁸ = 128515873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128516119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9179717 + ... + 9179730.

It is an arithmetic number, because the mean of its divisors is an integer number (36718896).

Almost surely, 2^128516129 is an apocalyptic number.

It is an amenable number.

128516129 is a deficient number, since it is larger than the sum of its proper divisors (18359455).

128516129 is an equidigital number, since it uses as much as digits as its factorization.

128516129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18359454.

The product of its digits is 8640, while the sum is 35.

The square root of 128516129 is about 11336.4954461244. The cubic root of 128516129 is about 504.6448884055.

The spelling of 128516129 in words is "one hundred twenty-eight million, five hundred sixteen thousand, one hundred twenty-nine".