28845121 has 2 divisors, whose sum is σ = 28845122. Its totient is φ = 28845120.

The previous prime is 28845119. The next prime is 28845127. The reversal of 28845121 is 12154882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16313521 + 12531600 = 4039^2 + 3540^2 .

It is a cyclic number.

It is not a de Polignac number, because 28845121 - 2¹ = 28845119 is a prime.

Together with 28845119, 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 (28845127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14422560 + 14422561.

It is an arithmetic number, because the mean of its divisors is an integer number (14422561).

Almost surely, 2^28845121 is an apocalyptic number.

It is an amenable number.

28845121 is a deficient number, since it is larger than the sum of its proper divisors (1).

28845121 is an equidigital number, since it uses as much as digits as its factorization.

28845121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5120, while the sum is 31.

The square root of 28845121 is about 5370.7654016909. The cubic root of 28845121 is about 306.6837665061.

The spelling of 28845121 in words is "twenty-eight million, eight hundred forty-five thousand, one hundred twenty-one".