856684051 has 16 divisors (see below), whose sum is σ = 892029024. Its totient is φ = 822057984.

The previous prime is 856684019. The next prime is 856684069. The reversal of 856684051 is 150486658.

It is a cyclic number.

It is not a de Polignac number, because 856684051 - 2⁵ = 856684019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 856683989 and 856684007.

It is not an unprimeable number, because it can be changed into a prime (856684001) 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 15 ways as a sum of consecutive naturals, for example, 1397221 + ... + 1397833.

It is an arithmetic number, because the mean of its divisors is an integer number (55751814).

Almost surely, 2^856684051 is an apocalyptic number.

856684051 is a deficient number, since it is larger than the sum of its proper divisors (35344973).

856684051 is a wasteful number, since it uses less digits than its factorization.

856684051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110.

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 856684051 is about 29269.1655330315. The cubic root of 856684051 is about 949.7447332622.

The spelling of 856684051 in words is "eight hundred fifty-six million, six hundred eighty-four thousand, fifty-one".