509813489 has 4 divisors (see below), whose sum is σ = 510157824. Its totient is φ = 509469156.

The previous prime is 509813431. The next prime is 509813501. The reversal of 509813489 is 984318905.

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, and also an emirpimes, since its reverse is a distinct semiprime: 984318905 = 5 ⋅196863781.

It is a cyclic number.

It is not a de Polignac number, because 509813489 - 2¹² = 509809393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509813419) 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, 169937 + ... + 172910.

It is an arithmetic number, because the mean of its divisors is an integer number (127539456).

Almost surely, 2^509813489 is an apocalyptic number.

It is an amenable number.

509813489 is a deficient number, since it is larger than the sum of its proper divisors (344335).

509813489 is a wasteful number, since it uses less digits than its factorization.

509813489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344334.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 509813489 is about 22579.0497807149. The cubic root of 509813489 is about 798.8595672264.

The spelling of 509813489 in words is "five hundred nine million, eight hundred thirteen thousand, four hundred eighty-nine".