857949089 has 2 divisors, whose sum is σ = 857949090. Its totient is φ = 857949088.

The previous prime is 857949077. The next prime is 857949119. The reversal of 857949089 is 980949758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 551874064 + 306075025 = 23492^2 + 17495^2 .

It is a cyclic number.

It is not a de Polignac number, because 857949089 - 2¹² = 857944993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (857949049) 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, 428974544 + 428974545.

It is an arithmetic number, because the mean of its divisors is an integer number (428974545).

Almost surely, 2^857949089 is an apocalyptic number.

It is an amenable number.

857949089 is a deficient number, since it is larger than the sum of its proper divisors (1).

857949089 is an equidigital number, since it uses as much as digits as its factorization.

857949089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 59.

The square root of 857949089 is about 29290.7679824207. The cubic root of 857949089 is about 950.2119892569.

The spelling of 857949089 in words is "eight hundred fifty-seven million, nine hundred forty-nine thousand, eighty-nine".