856480871 has 2 divisors, whose sum is σ = 856480872. Its totient is φ = 856480870.

The previous prime is 856480853. The next prime is 856480873. The reversal of 856480871 is 178084658.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856480871 - 2¹⁰ = 856479847 is a prime.

Together with 856480873, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856480873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428240435 + 428240436.

It is an arithmetic number, because the mean of its divisors is an integer number (428240436).

Almost surely, 2^856480871 is an apocalyptic number.

856480871 is a deficient number, since it is larger than the sum of its proper divisors (1).

856480871 is an equidigital number, since it uses as much as digits as its factorization.

856480871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 430080, while the sum is 47.

The square root of 856480871 is about 29265.6944390527. The cubic root of 856480871 is about 949.6696435827.

The spelling of 856480871 in words is "eight hundred fifty-six million, four hundred eighty thousand, eight hundred seventy-one".