8998921 has 2 divisors, whose sum is σ = 8998922. Its totient is φ = 8998920.

The previous prime is 8998919. The next prime is 8998963. The reversal of 8998921 is 1298998.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6864400 + 2134521 = 2620^2 + 1461^2 .

It is a cyclic number.

It is not a de Polignac number, because 8998921 - 2¹ = 8998919 is a prime.

Together with 8998919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8998901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4499460 + 4499461.

It is an arithmetic number, because the mean of its divisors is an integer number (4499461).

Almost surely, 2^8998921 is an apocalyptic number.

It is an amenable number.

8998921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8998921 is an equidigital number, since it uses as much as digits as its factorization.

8998921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 46.

The square root of 8998921 is about 2999.8201612763. The cubic root of 8998921 is about 208.0000693417. Note that the first 4 decimals are identical.

The spelling of 8998921 in words is "eight million, nine hundred ninety-eight thousand, nine hundred twenty-one".