505980689 has 2 divisors, whose sum is σ = 505980690. Its totient is φ = 505980688.

The previous prime is 505980679. The next prime is 505980731. The reversal of 505980689 is 986089505.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 403809025 + 102171664 = 20095^2 + 10108^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505980689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (505980619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252990344 + 252990345.

It is an arithmetic number, because the mean of its divisors is an integer number (252990345).

Almost surely, 2^505980689 is an apocalyptic number.

It is an amenable number.

505980689 is a deficient number, since it is larger than the sum of its proper divisors (1).

505980689 is an equidigital number, since it uses as much as digits as its factorization.

505980689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 50.

The square root of 505980689 is about 22494.0145149771. The cubic root of 505980689 is about 796.8525755761.

The spelling of 505980689 in words is "five hundred five million, nine hundred eighty thousand, six hundred eighty-nine".