28375181 has 2 divisors, whose sum is σ = 28375182. Its totient is φ = 28375180.

The previous prime is 28375177. The next prime is 28375183. The reversal of 28375181 is 18157382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16362025 + 12013156 = 4045^2 + 3466^2 .

It is a cyclic number.

It is not a de Polignac number, because 28375181 - 2² = 28375177 is a prime.

It is a super-2 number, since 2×28375181² = 1610301793565522, which contains 22 as substring.

Together with 28375183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28375183) 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, 14187590 + 14187591.

It is an arithmetic number, because the mean of its divisors is an integer number (14187591).

Almost surely, 2^28375181 is an apocalyptic number.

It is an amenable number.

28375181 is a deficient number, since it is larger than the sum of its proper divisors (1).

28375181 is an equidigital number, since it uses as much as digits as its factorization.

28375181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 35.

The square root of 28375181 is about 5326.8359276403. The cubic root of 28375181 is about 305.0091585533.

The spelling of 28375181 in words is "twenty-eight million, three hundred seventy-five thousand, one hundred eighty-one".