859800181 has 2 divisors, whose sum is σ = 859800182. Its totient is φ = 859800180.

The previous prime is 859800167. The next prime is 859800233. The reversal of 859800181 is 181008958.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 709369956 + 150430225 = 26634^2 + 12265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-859800181 is a prime.

It is a super-2 number, since 2×859800181² = 1478512702495265522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (859800121) 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, 429900090 + 429900091.

It is an arithmetic number, because the mean of its divisors is an integer number (429900091).

Almost surely, 2^859800181 is an apocalyptic number.

It is an amenable number.

859800181 is a deficient number, since it is larger than the sum of its proper divisors (1).

859800181 is an equidigital number, since it uses as much as digits as its factorization.

859800181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 40.

The square root of 859800181 is about 29322.3495136389. The cubic root of 859800181 is about 950.8948838245.

The spelling of 859800181 in words is "eight hundred fifty-nine million, eight hundred thousand, one hundred eighty-one".