856922089 has 2 divisors, whose sum is σ = 856922090. Its totient is φ = 856922088.

The previous prime is 856922081. The next prime is 856922113. The reversal of 856922089 is 980229658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 839840400 + 17081689 = 28980^2 + 4133^2 .

It is a cyclic number.

It is not a de Polignac number, because 856922089 - 2³ = 856922081 is a prime.

It is a super-2 number, since 2×856922089² = 1468630933232247842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (856922081) 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, 428461044 + 428461045.

It is an arithmetic number, because the mean of its divisors is an integer number (428461045).

Almost surely, 2^856922089 is an apocalyptic number.

It is an amenable number.

856922089 is a deficient number, since it is larger than the sum of its proper divisors (1).

856922089 is an equidigital number, since it uses as much as digits as its factorization.

856922089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 49.

The square root of 856922089 is about 29273.2316118327. The cubic root of 856922089 is about 949.8326903882.

The spelling of 856922089 in words is "eight hundred fifty-six million, nine hundred twenty-two thousand, eighty-nine".