509697 has 6 divisors (see below), whose sum is σ = 736242. Its totient is φ = 339792.

The previous prime is 509693. The next prime is 509699. The reversal of 509697 is 796905.

It can be written as a sum of positive squares in only one way, i.e., 484416 + 25281 = 696^2 + 159^2 .

It is not a de Polignac number, because 509697 - 2² = 509693 is a prime.

It is not an unprimeable number, because it can be changed into a prime (509693) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28308 + ... + 28325.

It is an arithmetic number, because the mean of its divisors is an integer number (122707).

2⁵⁰⁹⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

509697 is a deficient number, since it is larger than the sum of its proper divisors (226545).

509697 is a wasteful number, since it uses less digits than its factorization.

509697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56639 (or 56636 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 509697 is about 713.9306689028. The cubic root of 509697 is about 79.8798717888.

The spelling of 509697 in words is "five hundred nine thousand, six hundred ninety-seven".