509656601 has 4 divisors (see below), whose sum is σ = 509703012. Its totient is φ = 509610192.

The previous prime is 509656561. The next prime is 509656607. The reversal of 509656601 is 106656905.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 167443600 + 342213001 = 12940^2 + 18499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509656601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (509656607) 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, 3551 + ... + 32123.

It is an arithmetic number, because the mean of its divisors is an integer number (127425753).

Almost surely, 2^509656601 is an apocalyptic number.

It is an amenable number.

509656601 is a deficient number, since it is larger than the sum of its proper divisors (46411).

509656601 is a wasteful number, since it uses less digits than its factorization.

509656601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46410.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 509656601 is about 22575.5753193579. The cubic root of 509656601 is about 798.7776128509. Note that the first 3 decimals are identical.

The spelling of 509656601 in words is "five hundred nine million, six hundred fifty-six thousand, six hundred one".