509028257 has 4 divisors (see below), whose sum is σ = 509296260. Its totient is φ = 508760256.

The previous prime is 509028199. The next prime is 509028287. The reversal of 509028257 is 752820905.

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

It can be written as a sum of positive squares in 2 ways, for example, as 396647056 + 112381201 = 19916^2 + 10601^2 .

It is a cyclic number.

It is not a de Polignac number, because 509028257 - 2¹² = 509024161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 509028257.

It is not an unprimeable number, because it can be changed into a prime (509028287) 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, 131132 + ... + 134957.

It is an arithmetic number, because the mean of its divisors is an integer number (127324065).

Almost surely, 2^509028257 is an apocalyptic number.

It is an amenable number.

509028257 is a deficient number, since it is larger than the sum of its proper divisors (268003).

509028257 is a wasteful number, since it uses less digits than its factorization.

509028257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268002.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 509028257 is about 22561.6545714183. The cubic root of 509028257 is about 798.4492129544.

The spelling of 509028257 in words is "five hundred nine million, twenty-eight thousand, two hundred fifty-seven".