858802981 has 2 divisors, whose sum is σ = 858802982. Its totient is φ = 858802980.

The previous prime is 858802961. The next prime is 858803053. The reversal of 858802981 is 189208858.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 469372225 + 389430756 = 21665^2 + 19734^2 .

It is a cyclic number.

It is not a de Polignac number, because 858802981 - 2⁵ = 858802949 is a prime.

It is a super-2 number, since 2×858802981² = 1475085120348972722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (858802921) 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, 429401490 + 429401491.

It is an arithmetic number, because the mean of its divisors is an integer number (429401491).

Almost surely, 2^858802981 is an apocalyptic number.

It is an amenable number.

858802981 is a deficient number, since it is larger than the sum of its proper divisors (1).

858802981 is an equidigital number, since it uses as much as digits as its factorization.

858802981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 368640, while the sum is 49.

The square root of 858802981 is about 29305.3404859933. The cubic root of 858802981 is about 950.5271242669.

The spelling of 858802981 in words is "eight hundred fifty-eight million, eight hundred two thousand, nine hundred eighty-one".