509949887906 has 8 divisors (see below), whose sum is σ = 769796965020. Its totient is φ = 253350899568.

The previous prime is 509949887903. The next prime is 509949887933. The reversal of 509949887906 is 609788949905.

It can be written as a sum of positive squares in 2 ways, for example, as 400551017881 + 109398870025 = 632891^2 + 330755^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (509949887903) 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, 812021801 + ... + 812022428.

Almost surely, 2^509949887906 is an apocalyptic number.

509949887906 is a deficient number, since it is larger than the sum of its proper divisors (259847077114).

509949887906 is a wasteful number, since it uses less digits than its factorization.

509949887906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624044388.

The product of its (nonzero) digits is 352719360, while the sum is 74.

The spelling of 509949887906 in words is "five hundred nine billion, nine hundred forty-nine million, eight hundred eighty-seven thousand, nine hundred six".