2128523899 has 2 divisors, whose sum is σ = 2128523900. Its totient is φ = 2128523898.

The previous prime is 2128523861. The next prime is 2128523909. The reversal of 2128523899 is 9983258212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2128523899 - 2⁹ = 2128523387 is a prime.

It is a super-2 number, since 2×2128523899² = 9061227977228324402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2128523099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064261949 + 1064261950.

It is an arithmetic number, because the mean of its divisors is an integer number (1064261950).

Almost surely, 2^2128523899 is an apocalyptic number.

2128523899 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128523899 is an equidigital number, since it uses as much as digits as its factorization.

2128523899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 49.

The square root of 2128523899 is about 46135.9285047998. The cubic root of 2128523899 is about 1286.3510645554.

The spelling of 2128523899 in words is "two billion, one hundred twenty-eight million, five hundred twenty-three thousand, eight hundred ninety-nine".