509858989 has 2 divisors, whose sum is σ = 509858990. Its totient is φ = 509858988.

The previous prime is 509858983. The next prime is 509859011. The reversal of 509858989 is 989858905.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286117225 + 223741764 = 16915^2 + 14958^2 .

It is a cyclic number.

It is not a de Polignac number, because 509858989 - 2³ = 509858981 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509858981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254929494 + 254929495.

It is an arithmetic number, because the mean of its divisors is an integer number (254929495).

Almost surely, 2^509858989 is an apocalyptic number.

It is an amenable number.

509858989 is a deficient number, since it is larger than the sum of its proper divisors (1).

509858989 is an equidigital number, since it uses as much as digits as its factorization.

509858989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9331200, while the sum is 61.

The square root of 509858989 is about 22580.0573294224. The cubic root of 509858989 is about 798.8833321455.

The spelling of 509858989 in words is "five hundred nine million, eight hundred fifty-eight thousand, nine hundred eighty-nine".