28041197 has 2 divisors, whose sum is σ = 28041198. Its totient is φ = 28041196.

The previous prime is 28041193. The next prime is 28041199. The reversal of 28041197 is 79114082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14638276 + 13402921 = 3826^2 + 3661^2 .

It is a cyclic number.

It is not a de Polignac number, because 28041197 - 2² = 28041193 is a prime.

Together with 28041199, 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 (28041193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14020598 + 14020599.

It is an arithmetic number, because the mean of its divisors is an integer number (14020599).

Almost surely, 2^28041197 is an apocalyptic number.

It is an amenable number.

28041197 is a deficient number, since it is larger than the sum of its proper divisors (1).

28041197 is an equidigital number, since it uses as much as digits as its factorization.

28041197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 28041197 is about 5295.3939419084. The cubic root of 28041197 is about 303.8077508217.

The spelling of 28041197 in words is "twenty-eight million, forty-one thousand, one hundred ninety-seven".