9418921 has 2 divisors, whose sum is σ = 9418922. Its totient is φ = 9418920.

The previous prime is 9418919. The next prime is 9418943. The reversal of 9418921 is 1298149.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7952400 + 1466521 = 2820^2 + 1211^2 .

It is an emirp because it is prime and its reverse (1298149) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9418921 - 2¹ = 9418919 is a prime.

It is a super-3 number, since 3×9418921³ (a number of 22 digits) contains 333 as substring.

Together with 9418919, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (9418951) 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, 4709460 + 4709461.

It is an arithmetic number, because the mean of its divisors is an integer number (4709461).

Almost surely, 2^9418921 is an apocalyptic number.

It is an amenable number.

9418921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9418921 is an equidigital number, since it uses as much as digits as its factorization.

9418921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 34.

The square root of 9418921 is about 3069.0260670121. The cubic root of 9418921 is about 211.1869370484.

The spelling of 9418921 in words is "nine million, four hundred eighteen thousand, nine hundred twenty-one".