856617653 has 2 divisors, whose sum is σ = 856617654. Its totient is φ = 856617652.

The previous prime is 856617647. The next prime is 856617659. The reversal of 856617653 is 356716658.

It is a balanced prime because it is at equal distance from previous prime (856617647) and next prime (856617659).

It can be written as a sum of positive squares in only one way, i.e., 621853969 + 234763684 = 24937^2 + 15322^2 .

It is a cyclic number.

It is not a de Polignac number, because 856617653 - 2¹² = 856613557 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 856617598 and 856617607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856617659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428308826 + 428308827.

It is an arithmetic number, because the mean of its divisors is an integer number (428308827).

Almost surely, 2^856617653 is an apocalyptic number.

It is an amenable number.

856617653 is a deficient number, since it is larger than the sum of its proper divisors (1).

856617653 is an equidigital number, since it uses as much as digits as its factorization.

856617653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 47.

The square root of 856617653 is about 29268.0312457124. The cubic root of 856617653 is about 949.7201957134.

The spelling of 856617653 in words is "eight hundred fifty-six million, six hundred seventeen thousand, six hundred fifty-three".