9090921001 has 2 divisors, whose sum is σ = 9090921002. Its totient is φ = 9090921000.

The previous prime is 9090920999. The next prime is 9090921029. The reversal of 9090921001 is 1001290909.

9090921001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7430440000 + 1660481001 = 86200^2 + 40749^2 .

It is a cyclic number.

It is not a de Polignac number, because 9090921001 - 2¹ = 9090920999 is a prime.

Together with 9090920999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9090921031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4545460500 + 4545460501.

It is an arithmetic number, because the mean of its divisors is an integer number (4545460501).

Almost surely, 2^9090921001 is an apocalyptic number.

It is an amenable number.

9090921001 is a deficient number, since it is larger than the sum of its proper divisors (1).

9090921001 is an equidigital number, since it uses as much as digits as its factorization.

9090921001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 9090921001 is about 95346.3213815824. The cubic root of 9090921001 is about 2087.0649338506.

The spelling of 9090921001 in words is "nine billion, ninety million, nine hundred twenty-one thousand, one".