128534969 has 4 divisors (see below), whose sum is σ = 130295796. Its totient is φ = 126774144.

The previous prime is 128534963. The next prime is 128535037. The reversal of 128534969 is 969435821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60637369 + 67897600 = 7787^2 + 8240^2 .

It is a cyclic number.

It is not a de Polignac number, because 128534969 - 2¹² = 128530873 is a prime.

It is a super-2 number, since 2×128534969² = 33042476511661922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128534963) 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, 880304 + ... + 880449.

It is an arithmetic number, because the mean of its divisors is an integer number (32573949).

Almost surely, 2^128534969 is an apocalyptic number.

It is an amenable number.

128534969 is a deficient number, since it is larger than the sum of its proper divisors (1760827).

128534969 is an equidigital number, since it uses as much as digits as its factorization.

128534969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760826.

The product of its digits is 466560, while the sum is 47.

The square root of 128534969 is about 11337.3263603021. The cubic root of 128534969 is about 504.6695469062.

The spelling of 128534969 in words is "one hundred twenty-eight million, five hundred thirty-four thousand, nine hundred sixty-nine".