9101921 has 2 divisors, whose sum is σ = 9101922. Its totient is φ = 9101920.

The previous prime is 9101909. The next prime is 9101923. The reversal of 9101921 is 1291019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7317025 + 1784896 = 2705^2 + 1336^2 .

It is an emirp because it is prime and its reverse (1291019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9101921 - 2⁶ = 9101857 is a prime.

Together with 9101923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9101923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4550960 + 4550961.

It is an arithmetic number, because the mean of its divisors is an integer number (4550961).

Almost surely, 2^9101921 is an apocalyptic number.

It is an amenable number.

9101921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9101921 is an equidigital number, since it uses as much as digits as its factorization.

9101921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 9101921 is about 3016.9390116474. The cubic root of 9101921 is about 208.7906376238.

The spelling of 9101921 in words is "nine million, one hundred one thousand, nine hundred twenty-one".