1000921 has 2 divisors, whose sum is σ = 1000922. Its totient is φ = 1000920.

The previous prime is 1000919. The next prime is 1000931. The reversal of 1000921 is 1290001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 931225 + 69696 = 965^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000921 - 2¹ = 1000919 is a prime.

Together with 1000919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1000931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500460 + 500461.

It is an arithmetic number, because the mean of its divisors is an integer number (500461).

2^1000921 is an apocalyptic number.

It is an amenable number.

1000921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000921 is an equidigital number, since it uses as much as digits as its factorization.

1000921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1000921 is about 1000.4603940187. The cubic root of 1000921 is about 100.0306905799.

Adding to 1000921 its reverse (1290001), we get a palindrome (2290922).

The spelling of 1000921 in words is "one million, nine hundred twenty-one", and thus it is an aban number.