8919557 has 2 divisors, whose sum is σ = 8919558. Its totient is φ = 8919556.

The previous prime is 8919551. The next prime is 8919571. The reversal of 8919557 is 7559198.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8444836 + 474721 = 2906^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 8919557 - 2⁴ = 8919541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8919551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4459778 + 4459779.

It is an arithmetic number, because the mean of its divisors is an integer number (4459779).

Almost surely, 2^8919557 is an apocalyptic number.

It is an amenable number.

8919557 is a deficient number, since it is larger than the sum of its proper divisors (1).

8919557 is an equidigital number, since it uses as much as digits as its factorization.

8919557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 44.

The square root of 8919557 is about 2986.5627400073. The cubic root of 8919557 is about 207.3867926534.

The spelling of 8919557 in words is "eight million, nine hundred nineteen thousand, five hundred fifty-seven".