9042128905 has 4 divisors (see below), whose sum is σ = 10850554692. Its totient is φ = 7233703120.

The previous prime is 9042128773. The next prime is 9042128923. The reversal of 9042128905 is 5098212409.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3890765376 + 5151363529 = 62376^2 + 71773^2 .

It is not a de Polignac number, because 9042128905 - 2¹¹ = 9042126857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 904212886 + ... + 904212895.

It is an arithmetic number, because the mean of its divisors is an integer number (2712638673).

Almost surely, 2^9042128905 is an apocalyptic number.

It is an amenable number.

9042128905 is a deficient number, since it is larger than the sum of its proper divisors (1808425787).

9042128905 is a wasteful number, since it uses less digits than its factorization.

9042128905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808425786.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 9042128905 is about 95090.1093962984. The cubic root of 9042128905 is about 2083.3243887545.

The spelling of 9042128905 in words is "nine billion, forty-two million, one hundred twenty-eight thousand, nine hundred five".