509781085 has 32 divisors (see below), whose sum is σ = 713422080. Its totient is φ = 345945600.

The previous prime is 509781071. The next prime is 509781109. The reversal of 509781085 is 580187905.

It is not a de Polignac number, because 509781085 - 2⁹ = 509780573 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46951 + ... + 56779.

It is an arithmetic number, because the mean of its divisors is an integer number (22294440).

Almost surely, 2^509781085 is an apocalyptic number.

509781085 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

509781085 is a deficient number, since it is larger than the sum of its proper divisors (203640995).

509781085 is a wasteful number, since it uses less digits than its factorization.

509781085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9909.

The product of its (nonzero) digits is 100800, while the sum is 43.

The square root of 509781085 is about 22578.3322014714. The cubic root of 509781085 is about 798.8426415634.

The spelling of 509781085 in words is "five hundred nine million, seven hundred eighty-one thousand, eighty-five".