230128909 has 2 divisors, whose sum is σ = 230128910. Its totient is φ = 230128908.

The previous prime is 230128897. The next prime is 230128933. The reversal of 230128909 is 909821032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230128900 + 9 = 15170^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 230128909 - 2⁷ = 230128781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (230128979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115064454 + 115064455.

It is an arithmetic number, because the mean of its divisors is an integer number (115064455).

Almost surely, 2^230128909 is an apocalyptic number.

It is an amenable number.

230128909 is a deficient number, since it is larger than the sum of its proper divisors (1).

230128909 is an equidigital number, since it uses as much as digits as its factorization.

230128909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 230128909 is about 15170.0002966381. Note that the first 3 decimals coincide. The cubic root of 230128909 is about 612.8070122114.

The spelling of 230128909 in words is "two hundred thirty million, one hundred twenty-eight thousand, nine hundred nine".