128986567609 has 3 divisors (see below), whose sum is σ = 128986926757. Its totient is φ = 128986208462.

The previous prime is 128986567571. The next prime is 128986567639. The reversal of 128986567609 is 906765689821.

The square root of 128986567609 is 359147.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 128986567609 - 2²⁵ = 128953013177 is a prime.

It is a super-2 number, since 2×128986567609² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128986567639) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 179574 + ... + 538720.

Almost surely, 2^128986567609 is an apocalyptic number.

128986567609 is the 359147-th square number.

128986567609 is the 179574-th centered octagonal number.

It is an amenable number.

128986567609 is a deficient number, since it is larger than the sum of its proper divisors (359148).

128986567609 is an frugal number, since it uses more digits than its factorization.

128986567609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718294 (or 359147 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 67.

The spelling of 128986567609 in words is "one hundred twenty-eight billion, nine hundred eighty-six million, five hundred sixty-seven thousand, six hundred nine".