509949005 has 6 divisors (see below), whose sum is σ = 611999406. Its totient is φ = 407918808.

The previous prime is 509949001. The next prime is 509949023. The reversal of 509949005 is 500949905.

It can be written as a sum of positive squares in only one way, i.e., 407959204 + 101989801 = 20198^2 + 10099^2 .

It is not a de Polignac number, because 509949005 - 2² = 509949001 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 (509949001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45446 + ... + 55544.

It is an arithmetic number, because the mean of its divisors is an integer number (101999901).

Almost surely, 2^509949005 is an apocalyptic number.

It is an amenable number.

509949005 is a deficient number, since it is larger than the sum of its proper divisors (102050401).

509949005 is an frugal number, since it uses more digits than its factorization.

509949005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20203 (or 10104 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 509949005 is about 22582.0505047704. The cubic root of 509949005 is about 798.9303438696.

The spelling of 509949005 in words is "five hundred nine million, nine hundred forty-nine thousand, five".