9012903721 has 2 divisors, whose sum is σ = 9012903722. Its totient is φ = 9012903720.

The previous prime is 9012903703. The next prime is 9012903727. The reversal of 9012903721 is 1273092109.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6438457600 + 2574446121 = 80240^2 + 50739^2 .

It is an emirp because it is prime and its reverse (1273092109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9012903721 - 2¹⁵ = 9012870953 is a prime.

It is not a weakly prime, because it can be changed into another prime (9012903727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4506451860 + 4506451861.

It is an arithmetic number, because the mean of its divisors is an integer number (4506451861).

Almost surely, 2^9012903721 is an apocalyptic number.

It is an amenable number.

9012903721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9012903721 is an equidigital number, since it uses as much as digits as its factorization.

9012903721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 9012903721 is about 94936.3140268254. The cubic root of 9012903721 is about 2081.0774528249.

The spelling of 9012903721 in words is "nine billion, twelve million, nine hundred three thousand, seven hundred twenty-one".