28163171 has 2 divisors, whose sum is σ = 28163172. Its totient is φ = 28163170.

The previous prime is 28163129. The next prime is 28163197. The reversal of 28163171 is 17136182.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28163171 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_1750961 and since 28163171 and 1750961 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28163671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14081585 + 14081586.

It is an arithmetic number, because the mean of its divisors is an integer number (14081586).

Almost surely, 2^28163171 is an apocalyptic number.

28163171 is a deficient number, since it is larger than the sum of its proper divisors (1).

28163171 is an equidigital number, since it uses as much as digits as its factorization.

28163171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 29.

The square root of 28163171 is about 5306.8984350560. The cubic root of 28163171 is about 304.2476160935.

The spelling of 28163171 in words is "twenty-eight million, one hundred sixty-three thousand, one hundred seventy-one".