856305269 has 2 divisors, whose sum is σ = 856305270. Its totient is φ = 856305268.

The previous prime is 856305209. The next prime is 856305287. The reversal of 856305269 is 962503658.

It is a happy number.

856305269 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., 744580369 + 111724900 = 27287^2 + 10570^2 .

It is a cyclic number.

It is not a de Polignac number, because 856305269 - 2⁸ = 856305013 is a prime.

It is a super-2 number, since 2×856305269² = 1466517427434324722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856305209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428152634 + 428152635.

It is an arithmetic number, because the mean of its divisors is an integer number (428152635).

Almost surely, 2^856305269 is an apocalyptic number.

It is an amenable number.

856305269 is a deficient number, since it is larger than the sum of its proper divisors (1).

856305269 is an equidigital number, since it uses as much as digits as its factorization.

856305269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 44.

The square root of 856305269 is about 29262.6941514277. The cubic root of 856305269 is about 949.6047363977.

The spelling of 856305269 in words is "eight hundred fifty-six million, three hundred five thousand, two hundred sixty-nine".