28190161 has 2 divisors, whose sum is σ = 28190162. Its totient is φ = 28190160.

The previous prime is 28190147. The next prime is 28190179. The reversal of 28190161 is 16109182.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18147600 + 10042561 = 4260^2 + 3169^2 .

It is a cyclic number.

It is not a de Polignac number, because 28190161 - 2¹⁷ = 28059089 is a prime.

It is not a weakly prime, because it can be changed into another prime (28190861) 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, 14095080 + 14095081.

It is an arithmetic number, because the mean of its divisors is an integer number (14095081).

Almost surely, 2^28190161 is an apocalyptic number.

It is an amenable number.

28190161 is a deficient number, since it is larger than the sum of its proper divisors (1).

28190161 is an equidigital number, since it uses as much as digits as its factorization.

28190161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 28190161 is about 5309.4407426771. The cubic root of 28190161 is about 304.3447763335.

The spelling of 28190161 in words is "twenty-eight million, one hundred ninety thousand, one hundred sixty-one".