9381997 has 2 divisors, whose sum is σ = 9381998. Its totient is φ = 9381996.

The previous prime is 9381949. The next prime is 9382027. The reversal of 9381997 is 7991839.

9381997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5900041 + 3481956 = 2429^2 + 1866^2 .

It is an emirp because it is prime and its reverse (7991839) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9381997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9381917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4690998 + 4690999.

It is an arithmetic number, because the mean of its divisors is an integer number (4690999).

Almost surely, 2^9381997 is an apocalyptic number.

It is an amenable number.

9381997 is a deficient number, since it is larger than the sum of its proper divisors (1).

9381997 is an equidigital number, since it uses as much as digits as its factorization.

9381997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 46.

The square root of 9381997 is about 3063.0045706789. The cubic root of 9381997 is about 210.9106110435.

The spelling of 9381997 in words is "nine million, three hundred eighty-one thousand, nine hundred ninety-seven".