9001447921 has 2 divisors, whose sum is σ = 9001447922. Its totient is φ = 9001447920.

The previous prime is 9001447909. The next prime is 9001447927. The reversal of 9001447921 is 1297441009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6849879696 + 2151568225 = 82764^2 + 46385^2 .

It is an emirp because it is prime and its reverse (1297441009) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9001447921 - 2¹³ = 9001439729 is a prime.

It is not a weakly prime, because it can be changed into another prime (9001447927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4500723960 + 4500723961.

It is an arithmetic number, because the mean of its divisors is an integer number (4500723961).

Almost surely, 2^9001447921 is an apocalyptic number.

It is an amenable number.

9001447921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9001447921 is an equidigital number, since it uses as much as digits as its factorization.

9001447921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 9001447921 is about 94875.9607118684. The cubic root of 9001447921 is about 2080.1953651093.

The spelling of 9001447921 in words is "nine billion, one million, four hundred forty-seven thousand, nine hundred twenty-one".