856206959 has 2 divisors, whose sum is σ = 856206960. Its totient is φ = 856206958.

The previous prime is 856206931. The next prime is 856206979. The reversal of 856206959 is 959602658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856206959 - 2²⁰ = 855158383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856206979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428103479 + 428103480.

It is an arithmetic number, because the mean of its divisors is an integer number (428103480).

Almost surely, 2^856206959 is an apocalyptic number.

856206959 is a deficient number, since it is larger than the sum of its proper divisors (1).

856206959 is an equidigital number, since it uses as much as digits as its factorization.

856206959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The square root of 856206959 is about 29261.0143193977. The cubic root of 856206959 is about 949.5683945237.

The spelling of 856206959 in words is "eight hundred fifty-six million, two hundred six thousand, nine hundred fifty-nine".