28171903 has 2 divisors, whose sum is σ = 28171904. Its totient is φ = 28171902.

The previous prime is 28171883. The next prime is 28171909. The reversal of 28171903 is 30917182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28171903 - 2⁹ = 28171391 is a prime.

It is a super-2 number, since 2×28171903² = 1587312237282818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28171909) 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, 14085951 + 14085952.

It is an arithmetic number, because the mean of its divisors is an integer number (14085952).

Almost surely, 2^28171903 is an apocalyptic number.

28171903 is a deficient number, since it is larger than the sum of its proper divisors (1).

28171903 is an equidigital number, since it uses as much as digits as its factorization.

28171903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 28171903 is about 5307.7210740581. The cubic root of 28171903 is about 304.2790568673.

The spelling of 28171903 in words is "twenty-eight million, one hundred seventy-one thousand, nine hundred three".