505689821 has 8 divisors (see below), whose sum is σ = 622387584. Its totient is φ = 400106160.

The previous prime is 505689787. The next prime is 505689829. The reversal of 505689821 is 128986505.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 505689821 - 2⁶ = 505689757 is a prime.

It is a super-3 number, since 3×505689821³ (a number of 27 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505689829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2778425 + ... + 2778606.

It is an arithmetic number, because the mean of its divisors is an integer number (77798448).

Almost surely, 2^505689821 is an apocalyptic number.

It is an amenable number.

505689821 is a deficient number, since it is larger than the sum of its proper divisors (116697763).

505689821 is a wasteful number, since it uses less digits than its factorization.

505689821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5557051.

The product of its (nonzero) digits is 172800, while the sum is 44.

The square root of 505689821 is about 22487.5481322442. The cubic root of 505689821 is about 796.6998534481.

The spelling of 505689821 in words is "five hundred five million, six hundred eighty-nine thousand, eight hundred twenty-one".