128423201 has 2 divisors, whose sum is σ = 128423202. Its totient is φ = 128423200.

The previous prime is 128423177. The next prime is 128423203. The reversal of 128423201 is 102324821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104019601 + 24403600 = 10199^2 + 4940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128423201 is a prime.

Together with 128423203, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128423203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64211600 + 64211601.

It is an arithmetic number, because the mean of its divisors is an integer number (64211601).

Almost surely, 2^128423201 is an apocalyptic number.

It is an amenable number.

128423201 is a deficient number, since it is larger than the sum of its proper divisors (1).

128423201 is an equidigital number, since it uses as much as digits as its factorization.

128423201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 128423201 is about 11332.3960837945. The cubic root of 128423201 is about 504.5232254717.

The spelling of 128423201 in words is "one hundred twenty-eight million, four hundred twenty-three thousand, two hundred one".