509765987 has 2 divisors, whose sum is σ = 509765988. Its totient is φ = 509765986.

The previous prime is 509765981. The next prime is 509766091. The reversal of 509765987 is 789567905.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 509765987 - 2²⁶ = 442657123 is a prime.

It is a super-2 number, since 2×509765987² = 519722723004168338, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (509765981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254882993 + 254882994.

It is an arithmetic number, because the mean of its divisors is an integer number (254882994).

Almost surely, 2^509765987 is an apocalyptic number.

509765987 is a deficient number, since it is larger than the sum of its proper divisors (1).

509765987 is an equidigital number, since it uses as much as digits as its factorization.

509765987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4762800, while the sum is 56.

The square root of 509765987 is about 22577.9978518911. The cubic root of 509765987 is about 798.8347551421.

The spelling of 509765987 in words is "five hundred nine million, seven hundred sixty-five thousand, nine hundred eighty-seven".