9381821 has 2 divisors, whose sum is σ = 9381822. Its totient is φ = 9381820.

The previous prime is 9381817. The next prime is 9381859. The reversal of 9381821 is 1281839.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9369721 + 12100 = 3061^2 + 110^2 .

It is a cyclic number.

It is not a de Polignac number, because 9381821 - 2² = 9381817 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9381881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4690910 + 4690911.

It is an arithmetic number, because the mean of its divisors is an integer number (4690911).

Almost surely, 2^9381821 is an apocalyptic number.

It is an amenable number.

9381821 is a deficient number, since it is larger than the sum of its proper divisors (1).

9381821 is an equidigital number, since it uses as much as digits as its factorization.

9381821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 32.

The square root of 9381821 is about 3062.9758405838. The cubic root of 9381821 is about 210.9092921878.

It can be divided in two parts, 93818 and 21, that added together give a palindrome (93839).

The spelling of 9381821 in words is "nine million, three hundred eighty-one thousand, eight hundred twenty-one".