989565977 has 2 divisors, whose sum is σ = 989565978. Its totient is φ = 989565976.

The previous prime is 989565953. The next prime is 989565989. The reversal of 989565977 is 779565989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 798684121 + 190881856 = 28261^2 + 13816^2 .

It is a cyclic number.

It is not a de Polignac number, because 989565977 - 2⁸ = 989565721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (989565677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494782988 + 494782989.

It is an arithmetic number, because the mean of its divisors is an integer number (494782989).

Almost surely, 2^989565977 is an apocalyptic number.

It is an amenable number.

989565977 is a deficient number, since it is larger than the sum of its proper divisors (1).

989565977 is an equidigital number, since it uses as much as digits as its factorization.

989565977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42865200, while the sum is 65.

The square root of 989565977 is about 31457.3676107840. The cubic root of 989565977 is about 996.5098251847.

The spelling of 989565977 in words is "nine hundred eighty-nine million, five hundred sixty-five thousand, nine hundred seventy-seven".