9397981 has 2 divisors, whose sum is σ = 9397982. Its totient is φ = 9397980.

The previous prime is 9397939. The next prime is 9398003. The reversal of 9397981 is 1897939.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9302500 + 95481 = 3050^2 + 309^2 .

It is an emirp because it is prime and its reverse (1897939) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9397981 - 2⁷ = 9397853 is a prime.

It is a super-2 number, since 2×9397981² = 176644093752722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9397901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4698990 + 4698991.

It is an arithmetic number, because the mean of its divisors is an integer number (4698991).

Almost surely, 2^9397981 is an apocalyptic number.

It is an amenable number.

9397981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9397981 is an equidigital number, since it uses as much as digits as its factorization.

9397981 is an odious number, because the sum of its binary digits is odd.

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

The square root of 9397981 is about 3065.6126630741. The cubic root of 9397981 is about 211.0303184124.

The spelling of 9397981 in words is "nine million, three hundred ninety-seven thousand, nine hundred eighty-one".