505856281 has 16 divisors (see below), whose sum is σ = 583974144. Its totient is φ = 429225984.

The previous prime is 505856279. The next prime is 505856311. The reversal of 505856281 is 182658505.

It is a cyclic number.

It is not a de Polignac number, because 505856281 - 2¹ = 505856279 is a prime.

It is a super-2 number, since 2×505856281² = 511781154054301922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505859281) 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 in 15 ways as a sum of consecutive naturals, for example, 313980 + ... + 315586.

It is an arithmetic number, because the mean of its divisors is an integer number (36498384).

Almost surely, 2^505856281 is an apocalyptic number.

It is an amenable number.

505856281 is a deficient number, since it is larger than the sum of its proper divisors (78117863).

505856281 is a wasteful number, since it uses less digits than its factorization.

505856281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040.

The product of its (nonzero) digits is 96000, while the sum is 40.

The square root of 505856281 is about 22491.2489871061. The cubic root of 505856281 is about 796.7872615147.

The spelling of 505856281 in words is "five hundred five million, eight hundred fifty-six thousand, two hundred eighty-one".