509699 has 2 divisors, whose sum is σ = 509700. Its totient is φ = 509698.

The previous prime is 509693. The next prime is 509723. The reversal of 509699 is 996905.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509699 is a prime.

It is a Sophie Germain prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (509693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254849 + 254850.

It is an arithmetic number, because the mean of its divisors is an integer number (254850).

2⁵⁰⁹⁶⁹⁹ is an apocalyptic number.

509699 is a deficient number, since it is larger than the sum of its proper divisors (1).

509699 is an equidigital number, since it uses as much as digits as its factorization.

509699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 509699 is about 713.9320695977. The cubic root of 509699 is about 79.8799762689.

The spelling of 509699 in words is "five hundred nine thousand, six hundred ninety-nine".