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128201 is a prime number
BaseRepresentation
bin11111010011001001
320111212012
4133103021
513100301
62425305
71042523
oct372311
9214765
10128201
1188357
1262235
1346478
1434a13
1527ebb
hex1f4c9

128201 has 2 divisors, whose sum is σ = 128202. Its totient is φ = 128200.

The previous prime is 128189. The next prime is 128203. The reversal of 128201 is 102821.

It can be divided in two parts, 12820 and 1, that added together give a palindrome (12821).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121801 + 6400 = 349^2 + 80^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-128201 is a prime.

Together with 128203, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (128203) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64100 + 64101.

It is an arithmetic number, because the mean of its divisors is an integer number (64101).

2128201 is an apocalyptic number.

It is an amenable number.

128201 is a deficient number, since it is larger than the sum of its proper divisors (1).

128201 is an equidigital number, since it uses as much as digits as its factorization.

128201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 128201 is about 358.0516722486. The cubic root of 128201 is about 50.4232077967.

The spelling of 128201 in words is "one hundred twenty-eight thousand, two hundred one".