509539931 has 2 divisors, whose sum is σ = 509539932. Its totient is φ = 509539930.

The previous prime is 509539903. The next prime is 509539937. The reversal of 509539931 is 139935905.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509539931 is a prime.

It is a super-2 number, since 2×509539931² = 519261882566969522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (509539937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254769965 + 254769966.

It is an arithmetic number, because the mean of its divisors is an integer number (254769966).

Almost surely, 2^509539931 is an apocalyptic number.

509539931 is a deficient number, since it is larger than the sum of its proper divisors (1).

509539931 is an equidigital number, since it uses as much as digits as its factorization.

509539931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 164025, while the sum is 44.

The square root of 509539931 is about 22572.9911841563. The cubic root of 509539931 is about 798.7166564500.

The spelling of 509539931 in words is "five hundred nine million, five hundred thirty-nine thousand, nine hundred thirty-one".