509231 has 4 divisors (see below), whose sum is σ = 523032. Its totient is φ = 495432.

The previous prime is 509227. The next prime is 509239. The reversal of 509231 is 132905.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 509231 - 2² = 509227 is a prime.

It is a super-2 number, since 2×509231² = 518632422722, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 509231.

It is not an unprimeable number, because it can be changed into a prime (509239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6845 + ... + 6918.

It is an arithmetic number, because the mean of its divisors is an integer number (130758).

2⁵⁰⁹²³¹ is an apocalyptic number.

509231 is a deficient number, since it is larger than the sum of its proper divisors (13801).

509231 is a wasteful number, since it uses less digits than its factorization.

509231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13800.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 509231 is about 713.6042320502. The cubic root of 509231 is about 79.8555204779.

The spelling of 509231 in words is "five hundred nine thousand, two hundred thirty-one".