856709263 has 2 divisors, whose sum is σ = 856709264. Its totient is φ = 856709262.

The previous prime is 856709251. The next prime is 856709327. The reversal of 856709263 is 362907658.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856709263 is a prime.

It is a super-2 number, since 2×856709263² = 1467901522620006338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856709363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428354631 + 428354632.

It is an arithmetic number, because the mean of its divisors is an integer number (428354632).

Almost surely, 2^856709263 is an apocalyptic number.

856709263 is a deficient number, since it is larger than the sum of its proper divisors (1).

856709263 is an equidigital number, since it uses as much as digits as its factorization.

856709263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 46.

The square root of 856709263 is about 29269.5962220185. The cubic root of 856709263 is about 949.7540500885.

The spelling of 856709263 in words is "eight hundred fifty-six million, seven hundred nine thousand, two hundred sixty-three".