509531139 has 48 divisors (see below), whose sum is σ = 812098560. Its totient is φ = 305933760.

The previous prime is 509531137. The next prime is 509531147. The reversal of 509531139 is 931135905.

It is not a de Polignac number, because 509531139 - 2¹ = 509531137 is a prime.

It is a super-2 number, since 2×509531139² = 519243963221274642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (509531137) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1539204 + ... + 1539534.

It is an arithmetic number, because the mean of its divisors is an integer number (16918720).

Almost surely, 2^509531139 is an apocalyptic number.

509531139 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

509531139 is a deficient number, since it is larger than the sum of its proper divisors (302567421).

509531139 is a wasteful number, since it uses less digits than its factorization.

509531139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 18225, while the sum is 36.

The square root of 509531139 is about 22572.7964373048. The cubic root of 509531139 is about 798.7120625299.

The spelling of 509531139 in words is "five hundred nine million, five hundred thirty-one thousand, one hundred thirty-nine".