509687 has 2 divisors, whose sum is σ = 509688. Its totient is φ = 509686.

The previous prime is 509681. The next prime is 509689. The reversal of 509687 is 786905.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 509687 - 2⁶ = 509623 is a prime.

Together with 509689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254843 + 254844.

It is an arithmetic number, because the mean of its divisors is an integer number (254844).

2⁵⁰⁹⁶⁸⁷ is an apocalyptic number.

509687 is a deficient number, since it is larger than the sum of its proper divisors (1).

509687 is an equidigital number, since it uses as much as digits as its factorization.

509687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 509687 is about 713.9236653873. The cubic root of 509687 is about 79.8793493843.

The spelling of 509687 in words is "five hundred nine thousand, six hundred eighty-seven".