2185128223 has 2 divisors, whose sum is σ = 2185128224. Its totient is φ = 2185128222.

The previous prime is 2185128109. The next prime is 2185128241. The reversal of 2185128223 is 3228215812.

2185128223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2185128223 - 2¹⁷ = 2184997151 is a prime.

It is a super-2 number, since 2×2185128223² = 9549570701902275458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2185128523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1092564111 + 1092564112.

It is an arithmetic number, because the mean of its divisors is an integer number (1092564112).

Almost surely, 2^2185128223 is an apocalyptic number.

2185128223 is a deficient number, since it is larger than the sum of its proper divisors (1).

2185128223 is an equidigital number, since it uses as much as digits as its factorization.

2185128223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 34.

The square root of 2185128223 is about 46745.3550954531. The cubic root of 2185128223 is about 1297.6541962539.

The spelling of 2185128223 in words is "two billion, one hundred eighty-five million, one hundred twenty-eight thousand, two hundred twenty-three".