485128309 has 4 divisors (see below), whose sum is σ = 485174880. Its totient is φ = 485081740.

The previous prime is 485128291. The next prime is 485128333. The reversal of 485128309 is 903821584.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-485128309 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (485128379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312 + ... + 31150.

It is an arithmetic number, because the mean of its divisors is an integer number (121293720).

Almost surely, 2^485128309 is an apocalyptic number.

It is an amenable number.

485128309 is a deficient number, since it is larger than the sum of its proper divisors (46571).

485128309 is a wasteful number, since it uses less digits than its factorization.

485128309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46570.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 485128309 is about 22025.6284586842. The cubic root of 485128309 is about 785.7520800191.

The spelling of 485128309 in words is "four hundred eighty-five million, one hundred twenty-eight thousand, three hundred nine".