9978601 has 2 divisors, whose sum is σ = 9978602. Its totient is φ = 9978600.

The previous prime is 9978599. The next prime is 9978607. The reversal of 9978601 is 1068799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9211225 + 767376 = 3035^2 + 876^2 .

It is a cyclic number.

It is not a de Polignac number, because 9978601 - 2¹ = 9978599 is a prime.

Together with 9978599, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9978607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989300 + 4989301.

It is an arithmetic number, because the mean of its divisors is an integer number (4989301).

Almost surely, 2^9978601 is an apocalyptic number.

It is an amenable number.

9978601 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978601 is an equidigital number, since it uses as much as digits as its factorization.

9978601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 9978601 is about 3158.8923691699. The cubic root of 9978601 is about 215.2896834293.

The spelling of 9978601 in words is "nine million, nine hundred seventy-eight thousand, six hundred one".