9978557 has 2 divisors, whose sum is σ = 9978558. Its totient is φ = 9978556.

The previous prime is 9978547. The next prime is 9978583. The reversal of 9978557 is 7558799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5112121 + 4866436 = 2261^2 + 2206^2 .

It is a cyclic number.

It is not a de Polignac number, because 9978557 - 2⁸ = 9978301 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9978547) 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, 4989278 + 4989279.

It is an arithmetic number, because the mean of its divisors is an integer number (4989279).

Almost surely, 2^9978557 is an apocalyptic number.

It is an amenable number.

9978557 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978557 is an equidigital number, since it uses as much as digits as its factorization.

9978557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 793800, while the sum is 50.

The square root of 9978557 is about 3158.8854046958. The cubic root of 9978557 is about 215.2893669935.

The spelling of 9978557 in words is "nine million, nine hundred seventy-eight thousand, five hundred fifty-seven".