2128523905 has 16 divisors (see below), whose sum is σ = 2573251200. Its totient is φ = 1690174080.

The previous prime is 2128523899. The next prime is 2128523909. The reversal of 2128523905 is 5093258212.

It is not a de Polignac number, because 2128523905 - 2¹⁹ = 2127999617 is a prime.

It is a super-2 number, since 2×2128523905² = 9061228028312898050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2128523909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 562861 + ... + 566629.

It is an arithmetic number, because the mean of its divisors is an integer number (160828200).

Almost surely, 2^2128523905 is an apocalyptic number.

It is an amenable number.

2128523905 is a deficient number, since it is larger than the sum of its proper divisors (444727295).

2128523905 is a wasteful number, since it uses less digits than its factorization.

2128523905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4584.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 2128523905 is about 46135.9285698251. The cubic root of 2128523905 is about 1286.3510657641.

The spelling of 2128523905 in words is "two billion, one hundred twenty-eight million, five hundred twenty-three thousand, nine hundred five".