509430329491 has 2 divisors, whose sum is σ = 509430329492. Its totient is φ = 509430329490.

The previous prime is 509430329483. The next prime is 509430329501. The reversal of 509430329491 is 194923034905.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 509430329491 - 2³ = 509430329483 is a prime.

It is not a weakly prime, because it can be changed into another prime (509430329591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254715164745 + 254715164746.

It is an arithmetic number, because the mean of its divisors is an integer number (254715164746).

Almost surely, 2^509430329491 is an apocalyptic number.

509430329491 is a deficient number, since it is larger than the sum of its proper divisors (1).

509430329491 is an equidigital number, since it uses as much as digits as its factorization.

509430329491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1049760, while the sum is 49.

The spelling of 509430329491 in words is "five hundred nine billion, four hundred thirty million, three hundred twenty-nine thousand, four hundred ninety-one".