988565917 has 2 divisors, whose sum is σ = 988565918. Its totient is φ = 988565916.

The previous prime is 988565857. The next prime is 988565957. The reversal of 988565917 is 719565889.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 569585956 + 418979961 = 23866^2 + 20469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-988565917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988565957) 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, 494282958 + 494282959.

It is an arithmetic number, because the mean of its divisors is an integer number (494282959).

Almost surely, 2^988565917 is an apocalyptic number.

It is an amenable number.

988565917 is a deficient number, since it is larger than the sum of its proper divisors (1).

988565917 is an equidigital number, since it uses as much as digits as its factorization.

988565917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 58.

The square root of 988565917 is about 31441.4681113971. The cubic root of 988565917 is about 996.1740195419.

The spelling of 988565917 in words is "nine hundred eighty-eight million, five hundred sixty-five thousand, nine hundred seventeen".