9012855121 has 2 divisors, whose sum is σ = 9012855122. Its totient is φ = 9012855120.

The previous prime is 9012855119. The next prime is 9012855179. The reversal of 9012855121 is 1215582109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9012844096 + 11025 = 94936^2 + 105^2 .

It is a cyclic number.

It is not a de Polignac number, because 9012855121 - 2¹ = 9012855119 is a prime.

Together with 9012855119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9012855191) 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, 4506427560 + 4506427561.

It is an arithmetic number, because the mean of its divisors is an integer number (4506427561).

Almost surely, 2^9012855121 is an apocalyptic number.

It is an amenable number.

9012855121 is a deficient number, since it is larger than the sum of its proper divisors (1).

9012855121 is an equidigital number, since it uses as much as digits as its factorization.

9012855121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 34.

The square root of 9012855121 is about 94936.0580654158. The cubic root of 9012855121 is about 2081.0737122418.

The spelling of 9012855121 in words is "nine billion, twelve million, eight hundred fifty-five thousand, one hundred twenty-one".