28133101 has 2 divisors, whose sum is σ = 28133102. Its totient is φ = 28133100.

The previous prime is 28133081. The next prime is 28133141. The reversal of 28133101 is 10133182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18361225 + 9771876 = 4285^2 + 3126^2 .

It is a cyclic number.

It is not a de Polignac number, because 28133101 - 2⁹ = 28132589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28133141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14066550 + 14066551.

It is an arithmetic number, because the mean of its divisors is an integer number (14066551).

Almost surely, 2^28133101 is an apocalyptic number.

It is an amenable number.

28133101 is a deficient number, since it is larger than the sum of its proper divisors (1).

28133101 is an equidigital number, since it uses as much as digits as its factorization.

28133101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 28133101 is about 5304.0645735134. The cubic root of 28133101 is about 304.1392951496.

Adding to 28133101 its reverse (10133182), we get a palindrome (38266283).

The spelling of 28133101 in words is "twenty-eight million, one hundred thirty-three thousand, one hundred one".