28381097 has 2 divisors, whose sum is σ = 28381098. Its totient is φ = 28381096.

The previous prime is 28381081. The next prime is 28381099. The reversal of 28381097 is 79018382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26790976 + 1590121 = 5176^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 28381097 - 2⁴ = 28381081 is a prime.

Together with 28381099, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28381097.

It is not a weakly prime, because it can be changed into another prime (28381099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14190548 + 14190549.

It is an arithmetic number, because the mean of its divisors is an integer number (14190549).

Almost surely, 2^28381097 is an apocalyptic number.

It is an amenable number.

28381097 is a deficient number, since it is larger than the sum of its proper divisors (1).

28381097 is an equidigital number, since it uses as much as digits as its factorization.

28381097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28381097 is about 5327.3912002030. The cubic root of 28381097 is about 305.0303544097.

The spelling of 28381097 in words is "twenty-eight million, three hundred eighty-one thousand, ninety-seven".