129565089 has 20 divisors (see below), whose sum is σ = 199795200. Its totient is φ = 83588760.

The previous prime is 129565067. The next prime is 129565091. The reversal of 129565089 is 980565921.

129565089 is a `hidden beast` number, since 1 + 2 + 9 + 565 + 0 + 89 = 666.

It is not a de Polignac number, because 129565089 - 2⁵ = 129565057 is a prime.

It is a super-2 number, since 2×129565089² = 33574224575155842, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (129565099) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23289 + ... + 28310.

It is an arithmetic number, because the mean of its divisors is an integer number (9989760).

Almost surely, 2^129565089 is an apocalyptic number.

It is an amenable number.

129565089 is a deficient number, since it is larger than the sum of its proper divisors (70230111).

129565089 is an equidigital number, since it uses as much as digits as its factorization.

129565089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51642 (or 51633 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The square root of 129565089 is about 11382.6661639530. Note that the first 3 decimals coincide. The cubic root of 129565089 is about 506.0141551655.

The spelling of 129565089 in words is "one hundred twenty-nine million, five hundred sixty-five thousand, eighty-nine".