28150121 has 2 divisors, whose sum is σ = 28150122. Its totient is φ = 28150120.

The previous prime is 28150103. The next prime is 28150163. The reversal of 28150121 is 12105182.

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., 21576025 + 6574096 = 4645^2 + 2564^2 .

It is a cyclic number.

It is not a de Polignac number, because 28150121 - 2¹⁰ = 28149097 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28150093 and 28150102.

It is not a weakly prime, because it can be changed into another prime (28152121) 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, 14075060 + 14075061.

It is an arithmetic number, because the mean of its divisors is an integer number (14075061).

Almost surely, 2^28150121 is an apocalyptic number.

It is an amenable number.

28150121 is a deficient number, since it is larger than the sum of its proper divisors (1).

28150121 is an equidigital number, since it uses as much as digits as its factorization.

28150121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 28150121 is about 5305.6687608632. The cubic root of 28150121 is about 304.2006156473.

The spelling of 28150121 in words is "twenty-eight million, one hundred fifty thousand, one hundred twenty-one".