505965689 has 2 divisors, whose sum is σ = 505965690. Its totient is φ = 505965688.

The previous prime is 505965671. The next prime is 505965731. The reversal of 505965689 is 986569505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 505890064 + 75625 = 22492^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 505965689 - 2¹² = 505961593 is a prime.

It is a super-3 number, since 3×505965689³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 505965689.

It is not a weakly prime, because it can be changed into another prime (505965619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252982844 + 252982845.

It is an arithmetic number, because the mean of its divisors is an integer number (252982845).

Almost surely, 2^505965689 is an apocalyptic number.

It is an amenable number.

505965689 is a deficient number, since it is larger than the sum of its proper divisors (1).

505965689 is an equidigital number, since it uses as much as digits as its factorization.

505965689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916000, while the sum is 53.

The square root of 505965689 is about 22493.6810904752. The cubic root of 505965689 is about 796.8447011604.

The spelling of 505965689 in words is "five hundred five million, nine hundred sixty-five thousand, six hundred eighty-nine".