856274681 has 2 divisors, whose sum is σ = 856274682. Its totient is φ = 856274680.

The previous prime is 856274651. The next prime is 856274689. The reversal of 856274681 is 186472658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 805651456 + 50623225 = 28384^2 + 7115^2 .

It is a cyclic number.

It is not a de Polignac number, because 856274681 - 2¹⁸ = 856012537 is a prime.

It is a super-2 number, since 2×856274681² = 1466412658643303522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (856274689) 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, 428137340 + 428137341.

It is an arithmetic number, because the mean of its divisors is an integer number (428137341).

Almost surely, 2^856274681 is an apocalyptic number.

It is an amenable number.

856274681 is a deficient number, since it is larger than the sum of its proper divisors (1).

856274681 is an equidigital number, since it uses as much as digits as its factorization.

856274681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 47.

The square root of 856274681 is about 29262.1715017871. The cubic root of 856274681 is about 949.5934293492.

The spelling of 856274681 in words is "eight hundred fifty-six million, two hundred seventy-four thousand, six hundred eighty-one".