9917381 has 2 divisors, whose sum is σ = 9917382. Its totient is φ = 9917380.

The previous prime is 9917371. The next prime is 9917387. The reversal of 9917381 is 1837199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6713281 + 3204100 = 2591^2 + 1790^2 .

It is a cyclic number.

It is not a de Polignac number, because 9917381 - 2⁶ = 9917317 is a prime.

It is a super-2 number, since 2×9917381² = 196708891798322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9917387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4958690 + 4958691.

It is an arithmetic number, because the mean of its divisors is an integer number (4958691).

Almost surely, 2^9917381 is an apocalyptic number.

It is an amenable number.

9917381 is a deficient number, since it is larger than the sum of its proper divisors (1).

9917381 is an equidigital number, since it uses as much as digits as its factorization.

9917381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 38.

The square root of 9917381 is about 3149.1873554935. The cubic root of 9917381 is about 214.8485033346.

The spelling of 9917381 in words is "nine million, nine hundred seventeen thousand, three hundred eighty-one".