986509 has 2 divisors, whose sum is σ = 986510. Its totient is φ = 986508.

The previous prime is 986507. The next prime is 986519. The reversal of 986509 is 905689.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 714025 + 272484 = 845^2 + 522^2 .

It is a cyclic number.

It is not a de Polignac number, because 986509 - 2¹ = 986507 is a prime.

Together with 986507, it forms a pair of twin primes.

It is a Chen prime.

986509 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (986507) 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, 493254 + 493255.

It is an arithmetic number, because the mean of its divisors is an integer number (493255).

2⁹⁸⁶⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

986509 is a deficient number, since it is larger than the sum of its proper divisors (1).

986509 is an equidigital number, since it uses as much as digits as its factorization.

986509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 986509 is about 993.2315943424. The cubic root of 986509 is about 99.5482624043.

The spelling of 986509 in words is "nine hundred eighty-six thousand, five hundred nine".