28984121 has 2 divisors, whose sum is σ = 28984122. Its totient is φ = 28984120.

The previous prime is 28984093. The next prime is 28984127. The reversal of 28984121 is 12148982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28472896 + 511225 = 5336^2 + 715^2 .

It is a cyclic number.

It is not a de Polignac number, because 28984121 - 2¹⁴ = 28967737 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28984127) 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, 14492060 + 14492061.

It is an arithmetic number, because the mean of its divisors is an integer number (14492061).

Almost surely, 2^28984121 is an apocalyptic number.

It is an amenable number.

28984121 is a deficient number, since it is larger than the sum of its proper divisors (1).

28984121 is an equidigital number, since it uses as much as digits as its factorization.

28984121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 35.

The square root of 28984121 is about 5383.6902771240. The cubic root of 28984121 is about 307.1755972516.

The spelling of 28984121 in words is "twenty-eight million, nine hundred eighty-four thousand, one hundred twenty-one".