505748689 has 2 divisors, whose sum is σ = 505748690. Its totient is φ = 505748688.

The previous prime is 505748681. The next prime is 505748693. The reversal of 505748689 is 986847505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 442387089 + 63361600 = 21033^2 + 7960^2 .

It is a cyclic number.

It is not a de Polignac number, because 505748689 - 2³ = 505748681 is a prime.

It is not a weakly prime, because it can be changed into another prime (505748681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252874344 + 252874345.

It is an arithmetic number, because the mean of its divisors is an integer number (252874345).

Almost surely, 2^505748689 is an apocalyptic number.

It is an amenable number.

505748689 is a deficient number, since it is larger than the sum of its proper divisors (1).

505748689 is an equidigital number, since it uses as much as digits as its factorization.

505748689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2419200, while the sum is 52.

The square root of 505748689 is about 22488.8569962993. The cubic root of 505748689 is about 796.7307671988.

The spelling of 505748689 in words is "five hundred five million, seven hundred forty-eight thousand, six hundred eighty-nine".