856520803 has 2 divisors, whose sum is σ = 856520804. Its totient is φ = 856520802.

The previous prime is 856520723. The next prime is 856520813. The reversal of 856520803 is 308025658.

856520803 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856520803 - 2²⁵ = 822966371 is a prime.

It is not a weakly prime, because it can be changed into another prime (856520813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428260401 + 428260402.

It is an arithmetic number, because the mean of its divisors is an integer number (428260402).

Almost surely, 2^856520803 is an apocalyptic number.

856520803 is a deficient number, since it is larger than the sum of its proper divisors (1).

856520803 is an equidigital number, since it uses as much as digits as its factorization.

856520803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 856520803 is about 29266.3766633316. The cubic root of 856520803 is about 949.6844022774.

The spelling of 856520803 in words is "eight hundred fifty-six million, five hundred twenty thousand, eight hundred three".