28569161 has 2 divisors, whose sum is σ = 28569162. Its totient is φ = 28569160.

The previous prime is 28569131. The next prime is 28569187. The reversal of 28569161 is 16196582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20757136 + 7812025 = 4556^2 + 2795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28569161 is a prime.

It is not a weakly prime, because it can be changed into another prime (28569131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14284580 + 14284581.

It is an arithmetic number, because the mean of its divisors is an integer number (14284581).

Almost surely, 2^28569161 is an apocalyptic number.

It is an amenable number.

28569161 is a deficient number, since it is larger than the sum of its proper divisors (1).

28569161 is an equidigital number, since it uses as much as digits as its factorization.

28569161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 38.

The square root of 28569161 is about 5345.0127221551. The cubic root of 28569161 is about 305.7026209421.

The spelling of 28569161 in words is "twenty-eight million, five hundred sixty-nine thousand, one hundred sixty-one".