905128796209 has 4 divisors (see below), whose sum is σ = 987413232240. Its totient is φ = 822844360180.

The previous prime is 905128796189. The next prime is 905128796219. The reversal of 905128796209 is 902697821509.

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 a cyclic number.

It is not a de Polignac number, because 905128796209 - 2¹¹ = 905128794161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (905128796219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41142217999 + ... + 41142218020.

It is an arithmetic number, because the mean of its divisors is an integer number (246853308060).

Almost surely, 2^905128796209 is an apocalyptic number.

It is an amenable number.

905128796209 is a deficient number, since it is larger than the sum of its proper divisors (82284436031).

905128796209 is a wasteful number, since it uses less digits than its factorization.

905128796209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82284436030.

The product of its (nonzero) digits is 4898880, while the sum is 58.

The spelling of 905128796209 in words is "nine hundred five billion, one hundred twenty-eight million, seven hundred ninety-six thousand, two hundred nine".