28541561 has 2 divisors, whose sum is σ = 28541562. Its totient is φ = 28541560.

The previous prime is 28541533. The next prime is 28541563. The reversal of 28541561 is 16514582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18011536 + 10530025 = 4244^2 + 3245^2 .

It is a cyclic number.

It is not a de Polignac number, because 28541561 - 2⁶ = 28541497 is a prime.

Together with 28541563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28541563) 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, 14270780 + 14270781.

It is an arithmetic number, because the mean of its divisors is an integer number (14270781).

Almost surely, 2^28541561 is an apocalyptic number.

It is an amenable number.

28541561 is a deficient number, since it is larger than the sum of its proper divisors (1).

28541561 is an equidigital number, since it uses as much as digits as its factorization.

28541561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9600, while the sum is 32.

The square root of 28541561 is about 5342.4302522354. The cubic root of 28541561 is about 305.6041451666.

The spelling of 28541561 in words is "twenty-eight million, five hundred forty-one thousand, five hundred sixty-one".