509432561 has 4 divisors (see below), whose sum is σ = 555744624. Its totient is φ = 463120500.

The previous prime is 509432507. The next prime is 509432569. The reversal of 509432561 is 165234905.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509432561 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509432569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23156015 + ... + 23156036.

It is an arithmetic number, because the mean of its divisors is an integer number (138936156).

Almost surely, 2^509432561 is an apocalyptic number.

509432561 is the 12065-th centered heptagonal number.

It is an amenable number.

509432561 is a deficient number, since it is larger than the sum of its proper divisors (46312063).

509432561 is a wasteful number, since it uses less digits than its factorization.

509432561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46312062.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 509432561 is about 22570.6127741362. The cubic root of 509432561 is about 798.6605507839.

The spelling of 509432561 in words is "five hundred nine million, four hundred thirty-two thousand, five hundred sixty-one".