856285230971 has 2 divisors, whose sum is σ = 856285230972. Its totient is φ = 856285230970.

The previous prime is 856285230967. The next prime is 856285231031. The reversal of 856285230971 is 179032582658.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 856285230971 - 2² = 856285230967 is a prime.

It is not a weakly prime, because it can be changed into another prime (856285230961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428142615485 + 428142615486.

It is an arithmetic number, because the mean of its divisors is an integer number (428142615486).

Almost surely, 2^856285230971 is an apocalyptic number.

856285230971 is a deficient number, since it is larger than the sum of its proper divisors (1).

856285230971 is an equidigital number, since it uses as much as digits as its factorization.

856285230971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7257600, while the sum is 56.

The spelling of 856285230971 in words is "eight hundred fifty-six billion, two hundred eighty-five million, two hundred thirty thousand, nine hundred seventy-one".