820560851 has 16 divisors (see below), whose sum is σ = 907614720. Its totient is φ = 735648480.

The previous prime is 820560833. The next prime is 820560863. The reversal of 820560851 is 158065028.

It is a happy number.

820560851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 820560851 - 2¹⁸ = 820298707 is a prime.

It is a super-2 number, since 2×820560851² = 1346640220387688402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820568851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279845 + ... + 282761.

It is an arithmetic number, because the mean of its divisors is an integer number (56725920).

Almost surely, 2^820560851 is an apocalyptic number.

820560851 is a deficient number, since it is larger than the sum of its proper divisors (87053869).

820560851 is a wasteful number, since it uses less digits than its factorization.

820560851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3274.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 820560851 is about 28645.4333358740. The cubic root of 820560851 is about 936.2035084041.

The spelling of 820560851 in words is "eight hundred twenty million, five hundred sixty thousand, eight hundred fifty-one".