509554640909 has 32 divisors (see below), whose sum is σ = 550991400960. Its totient is φ = 469769932800.

The previous prime is 509554640891. The next prime is 509554640939. The reversal of 509554640909 is 909046455905.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 509554640909 - 2²⁰ = 509553592333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509554640939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54898349 + ... + 54907629.

It is an arithmetic number, because the mean of its divisors is an integer number (17218481280).

Almost surely, 2^509554640909 is an apocalyptic number.

It is an amenable number.

509554640909 is a deficient number, since it is larger than the sum of its proper divisors (41436760051).

509554640909 is a wasteful number, since it uses less digits than its factorization.

509554640909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9861.

The product of its (nonzero) digits is 8748000, while the sum is 56.

The spelling of 509554640909 in words is "five hundred nine billion, five hundred fifty-four million, six hundred forty thousand, nine hundred nine".