9820381 has 2 divisors, whose sum is σ = 9820382. Its totient is φ = 9820380.

The previous prime is 9820367. The next prime is 9820387. The reversal of 9820381 is 1830289.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9765625 + 54756 = 3125^2 + 234^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9820381 is a prime.

It is a super-2 number, since 2×9820381² = 192879765970322, which contains 22 as substring.

It is equal to p₆₅₃₅₄₈ and since 9820381 and 653548 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9820387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4910190 + 4910191.

It is an arithmetic number, because the mean of its divisors is an integer number (4910191).

Almost surely, 2^9820381 is an apocalyptic number.

It is an amenable number.

9820381 is a deficient number, since it is larger than the sum of its proper divisors (1).

9820381 is an equidigital number, since it uses as much as digits as its factorization.

9820381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 9820381 is about 3133.7487136017. The cubic root of 9820381 is about 214.1457431518.

It can be divided in two parts, 9820 and 381, that added together give a palindrome (10201).

The spelling of 9820381 in words is "nine million, eight hundred twenty thousand, three hundred eighty-one".