9978361 has 2 divisors, whose sum is σ = 9978362. Its totient is φ = 9978360.

The previous prime is 9978359. The next prime is 9978383. The reversal of 9978361 is 1638799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9954025 + 24336 = 3155^2 + 156^2 .

It is an emirp because it is prime and its reverse (1638799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9978361 - 2¹ = 9978359 is a prime.

Together with 9978359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9978301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989180 + 4989181.

It is an arithmetic number, because the mean of its divisors is an integer number (4989181).

Almost surely, 2^9978361 is an apocalyptic number.

It is an amenable number.

9978361 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978361 is an equidigital number, since it uses as much as digits as its factorization.

9978361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 9978361 is about 3158.8543809426. The cubic root of 9978361 is about 215.2879574045.

The spelling of 9978361 in words is "nine million, nine hundred seventy-eight thousand, three hundred sixty-one".