28531361 has 2 divisors, whose sum is σ = 28531362. Its totient is φ = 28531360.

The previous prime is 28531343. The next prime is 28531379. The reversal of 28531361 is 16313582.

It is a balanced prime because it is at equal distance from previous prime (28531343) and next prime (28531379).

It can be written as a sum of positive squares in only one way, i.e., 23580736 + 4950625 = 4856^2 + 2225^2 .

It is a cyclic number.

It is not a de Polignac number, because 28531361 - 2⁶ = 28531297 is a prime.

It is a Chen prime.

It is equal to p_1772444 and since 28531361 and 1772444 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 (28530361) 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, 14265680 + 14265681.

It is an arithmetic number, because the mean of its divisors is an integer number (14265681).

Almost surely, 2^28531361 is an apocalyptic number.

It is an amenable number.

28531361 is a deficient number, since it is larger than the sum of its proper divisors (1).

28531361 is an equidigital number, since it uses as much as digits as its factorization.

28531361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 28531361 is about 5341.4755452028. The cubic root of 28531361 is about 305.5677358793.

The spelling of 28531361 in words is "twenty-eight million, five hundred thirty-one thousand, three hundred sixty-one".