856308953 has 2 divisors, whose sum is σ = 856308954. Its totient is φ = 856308952.

The previous prime is 856308917. The next prime is 856308979. The reversal of 856308953 is 359803658.

It is a happy number.

856308953 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 524959744 + 331349209 = 22912^2 + 18203^2 .

It is a cyclic number.

It is not a de Polignac number, because 856308953 - 2⁶ = 856308889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 856308898 and 856308907.

It is not a weakly prime, because it can be changed into another prime (856308253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428154476 + 428154477.

It is an arithmetic number, because the mean of its divisors is an integer number (428154477).

Almost surely, 2^856308953 is an apocalyptic number.

It is an amenable number.

856308953 is a deficient number, since it is larger than the sum of its proper divisors (1).

856308953 is an equidigital number, since it uses as much as digits as its factorization.

856308953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 47.

The square root of 856308953 is about 29262.7570984007. The cubic root of 856308953 is about 949.6060981935.

The spelling of 856308953 in words is "eight hundred fifty-six million, three hundred eight thousand, nine hundred fifty-three".