128168929 has 4 divisors (see below), whose sum is σ = 146478784. Its totient is φ = 109859076.

The previous prime is 128168921. The next prime is 128168941. The reversal of 128168929 is 929861821.

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.

It is a cyclic number.

It is not a de Polignac number, because 128168929 - 2³ = 128168921 is a prime.

It is a super-2 number, since 2×128168929² = 32854548722014082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128168921) 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, 9154917 + ... + 9154930.

It is an arithmetic number, because the mean of its divisors is an integer number (36619696).

Almost surely, 2^128168929 is an apocalyptic number.

It is an amenable number.

128168929 is a deficient number, since it is larger than the sum of its proper divisors (18309855).

128168929 is an equidigital number, since it uses as much as digits as its factorization.

128168929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18309854.

The product of its digits is 124416, while the sum is 46.

The square root of 128168929 is about 11321.1717149772. The cubic root of 128168929 is about 504.1900279167.

The spelling of 128168929 in words is "one hundred twenty-eight million, one hundred sixty-eight thousand, nine hundred twenty-nine".