28571131 has 2 divisors, whose sum is σ = 28571132. Its totient is φ = 28571130.

The previous prime is 28571113. The next prime is 28571143. The reversal of 28571131 is 13117582.

Together with previous prime (28571113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28571131 - 2¹¹ = 28569083 is a prime.

It is a super-2 number, since 2×28571131² = 1632619053238322, which contains 22 as substring.

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 28571131.

It is not a weakly prime, because it can be changed into another prime (28571161) 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, 14285565 + 14285566.

It is an arithmetic number, because the mean of its divisors is an integer number (14285566).

Almost surely, 2^28571131 is an apocalyptic number.

28571131 is a deficient number, since it is larger than the sum of its proper divisors (1).

28571131 is an equidigital number, since it uses as much as digits as its factorization.

28571131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 28.

The square root of 28571131 is about 5345.1970029177. The cubic root of 28571131 is about 305.7096474035.

The spelling of 28571131 in words is "twenty-eight million, five hundred seventy-one thousand, one hundred thirty-one".