229128609 has 4 divisors (see below), whose sum is σ = 305504816. Its totient is φ = 152752404.

The previous prime is 229128589. The next prime is 229128617. The reversal of 229128609 is 906821922.

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 not a de Polignac number, because 229128609 - 2⁵ = 229128577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (229120609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38188099 + ... + 38188104.

It is an arithmetic number, because the mean of its divisors is an integer number (76376204).

Almost surely, 2^229128609 is an apocalyptic number.

It is an amenable number.

229128609 is a deficient number, since it is larger than the sum of its proper divisors (76376207).

229128609 is an equidigital number, since it uses as much as digits as its factorization.

229128609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76376206.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 229128609 is about 15136.9947149360. The cubic root of 229128609 is about 611.9178277259.

The spelling of 229128609 in words is "two hundred twenty-nine million, one hundred twenty-eight thousand, six hundred nine".