505803685 has 4 divisors (see below), whose sum is σ = 606964428. Its totient is φ = 404642944.

The previous prime is 505803677. The next prime is 505803689. The reversal of 505803685 is 586308505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 586308505 = 5 ⋅117261701.

It can be written as a sum of positive squares in 2 ways, for example, as 226713249 + 279090436 = 15057^2 + 16706^2 .

It is a cyclic number.

It is not a de Polignac number, because 505803685 - 2³ = 505803677 is a prime.

It is a super-3 number, since 3×505803685³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505803689) 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 in 3 ways as a sum of consecutive naturals, for example, 50580364 + ... + 50580373.

It is an arithmetic number, because the mean of its divisors is an integer number (151741107).

Almost surely, 2^505803685 is an apocalyptic number.

It is an amenable number.

505803685 is a deficient number, since it is larger than the sum of its proper divisors (101160743).

505803685 is a wasteful number, since it uses less digits than its factorization.

505803685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101160742.

The product of its (nonzero) digits is 144000, while the sum is 40.

The square root of 505803685 is about 22490.0797019486. The cubic root of 505803685 is about 796.7596454527.

The spelling of 505803685 in words is "five hundred five million, eight hundred three thousand, six hundred eighty-five".