509045781 has 8 divisors (see below), whose sum is σ = 682139200. Its totient is φ = 337658112.

The previous prime is 509045711. The next prime is 509045819. The reversal of 509045781 is 187540905.

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

It is not a de Polignac number, because 509045781 - 2¹⁴ = 509029397 is a prime.

It is a super-2 number, since 2×509045781² = 518255214307799922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509045711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425740 + ... + 426933.

It is an arithmetic number, because the mean of its divisors is an integer number (85267400).

Almost surely, 2^509045781 is an apocalyptic number.

It is an amenable number.

509045781 is a deficient number, since it is larger than the sum of its proper divisors (173093419).

509045781 is a wasteful number, since it uses less digits than its factorization.

509045781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852875.

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 509045781 is about 22562.0429261182. The cubic root of 509045781 is about 798.4583754212.

The spelling of 509045781 in words is "five hundred nine million, forty-five thousand, seven hundred eighty-one".