8989921 has 2 divisors, whose sum is σ = 8989922. Its totient is φ = 8989920.

The previous prime is 8989919. The next prime is 8989973. The reversal of 8989921 is 1299898.

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., 6630625 + 2359296 = 2575^2 + 1536^2 .

It is a cyclic number.

It is not a de Polignac number, because 8989921 - 2¹ = 8989919 is a prime.

Together with 8989919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8989621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4494960 + 4494961.

It is an arithmetic number, because the mean of its divisors is an integer number (4494961).

Almost surely, 2^8989921 is an apocalyptic number.

It is an amenable number.

8989921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8989921 is an equidigital number, since it uses as much as digits as its factorization.

8989921 is an evil number, because the sum of its binary digits is even.

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

The square root of 8989921 is about 2998.3196960965. The cubic root of 8989921 is about 207.9307045424.

The spelling of 8989921 in words is "eight million, nine hundred eighty-nine thousand, nine hundred twenty-one".