858538081 has 2 divisors, whose sum is σ = 858538082. Its totient is φ = 858538080.

The previous prime is 858538033. The next prime is 858538091. The reversal of 858538081 is 180835858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 858197025 + 341056 = 29295^2 + 584^2 .

It is a cyclic number.

It is not a de Polignac number, because 858538081 - 2⁹ = 858537569 is a prime.

It is a super-2 number, since 2×858538081² = 1474175273054325122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (858538001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429269040 + 429269041.

It is an arithmetic number, because the mean of its divisors is an integer number (429269041).

Almost surely, 2^858538081 is an apocalyptic number.

It is an amenable number.

858538081 is a deficient number, since it is larger than the sum of its proper divisors (1).

858538081 is an equidigital number, since it uses as much as digits as its factorization.

858538081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 307200, while the sum is 46.

The square root of 858538081 is about 29300.8204833926. The cubic root of 858538081 is about 950.4293833670.

The spelling of 858538081 in words is "eight hundred fifty-eight million, five hundred thirty-eight thousand, eighty-one".