856968769 has 2 divisors, whose sum is σ = 856968770. Its totient is φ = 856968768.

The previous prime is 856968737. The next prime is 856968773. The reversal of 856968769 is 967869658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 846111744 + 10857025 = 29088^2 + 3295^2 .

It is a cyclic number.

It is not a de Polignac number, because 856968769 - 2⁵ = 856968737 is a prime.

It is a super-2 number, since 2×856968769² = 1468790942082750722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 856968769.

It is not a weakly prime, because it can be changed into another prime (856968709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428484384 + 428484385.

It is an arithmetic number, because the mean of its divisors is an integer number (428484385).

Almost surely, 2^856968769 is an apocalyptic number.

It is an amenable number.

856968769 is a deficient number, since it is larger than the sum of its proper divisors (1).

856968769 is an equidigital number, since it uses as much as digits as its factorization.

856968769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39191040, while the sum is 64.

The square root of 856968769 is about 29274.0289164303. The cubic root of 856968769 is about 949.8499371467.

The spelling of 856968769 in words is "eight hundred fifty-six million, nine hundred sixty-eight thousand, seven hundred sixty-nine".