856424659 has 2 divisors, whose sum is σ = 856424660. Its totient is φ = 856424658.

The previous prime is 856424603. The next prime is 856424669. The reversal of 856424659 is 956424658.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856424659 is a prime.

It is not a weakly prime, because it can be changed into another prime (856424669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428212329 + 428212330.

It is an arithmetic number, because the mean of its divisors is an integer number (428212330).

Almost surely, 2^856424659 is an apocalyptic number.

856424659 is a deficient number, since it is larger than the sum of its proper divisors (1).

856424659 is an equidigital number, since it uses as much as digits as its factorization.

856424659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2073600, while the sum is 49.

The square root of 856424659 is about 29264.7340497056. The cubic root of 856424659 is about 949.6488670931.

Subtracting 856424659 from its reverse (956424658), we obtain a palindrome (99999999).

The spelling of 856424659 in words is "eight hundred fifty-six million, four hundred twenty-four thousand, six hundred fifty-nine".