98765509 has 2 divisors, whose sum is σ = 98765510. Its totient is φ = 98765508.

The previous prime is 98765507. The next prime is 98765531. The reversal of 98765509 is 90556789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56580484 + 42185025 = 7522^2 + 6495^2 .

It is an emirp because it is prime and its reverse (90556789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98765509 - 2¹ = 98765507 is a prime.

Together with 98765507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98765507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49382754 + 49382755.

It is an arithmetic number, because the mean of its divisors is an integer number (49382755).

Almost surely, 2^98765509 is an apocalyptic number.

It is an amenable number.

98765509 is a deficient number, since it is larger than the sum of its proper divisors (1).

98765509 is an equidigital number, since it uses as much as digits as its factorization.

98765509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 680400, while the sum is 49.

The square root of 98765509 is about 9938.0837690170. The cubic root of 98765509 is about 462.2409695378.

The spelling of 98765509 in words is "ninety-eight million, seven hundred sixty-five thousand, five hundred nine".