128005169 has 4 divisors (see below), whose sum is σ = 132134400. Its totient is φ = 123875940.

The previous prime is 128005151. The next prime is 128005183. The reversal of 128005169 is 961500821.

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 128005169 - 2¹² = 128001073 is a prime.

It is a super-2 number, since 2×128005169² = 32770646581437122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128001169) 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, 2064569 + ... + 2064630.

It is an arithmetic number, because the mean of its divisors is an integer number (33033600).

Almost surely, 2^128005169 is an apocalyptic number.

It is an amenable number.

128005169 is a deficient number, since it is larger than the sum of its proper divisors (4129231).

128005169 is an equidigital number, since it uses as much as digits as its factorization.

128005169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129230.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 128005169 is about 11313.9369363630. The cubic root of 128005169 is about 503.9752037540.

The spelling of 128005169 in words is "one hundred twenty-eight million, five thousand, one hundred sixty-nine".