856332817 has 2 divisors, whose sum is σ = 856332818. Its totient is φ = 856332816.

The previous prime is 856332811. The next prime is 856332821. The reversal of 856332817 is 718233658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 616578561 + 239754256 = 24831^2 + 15484^2 .

It is a cyclic number.

It is not a de Polignac number, because 856332817 - 2⁷ = 856332689 is a prime.

It is not a weakly prime, because it can be changed into another prime (856332811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428166408 + 428166409.

It is an arithmetic number, because the mean of its divisors is an integer number (428166409).

Almost surely, 2^856332817 is an apocalyptic number.

It is an amenable number.

856332817 is a deficient number, since it is larger than the sum of its proper divisors (1).

856332817 is an equidigital number, since it uses as much as digits as its factorization.

856332817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 43.

The square root of 856332817 is about 29263.1648493460. The cubic root of 856332817 is about 949.6149194604.

The spelling of 856332817 in words is "eight hundred fifty-six million, three hundred thirty-two thousand, eight hundred seventeen".