866800141 has 2 divisors, whose sum is σ = 866800142. Its totient is φ = 866800140.

The previous prime is 866800139. The next prime is 866800177. The reversal of 866800141 is 141008668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 777573225 + 89226916 = 27885^2 + 9446^2 .

It is a cyclic number.

It is not a de Polignac number, because 866800141 - 2¹ = 866800139 is a prime.

Together with 866800139, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 866800097 and 866800106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866800841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433400070 + 433400071.

It is an arithmetic number, because the mean of its divisors is an integer number (433400071).

Almost surely, 2^866800141 is an apocalyptic number.

It is an amenable number.

866800141 is a deficient number, since it is larger than the sum of its proper divisors (1).

866800141 is an equidigital number, since it uses as much as digits as its factorization.

866800141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 866800141 is about 29441.4697493179. The cubic root of 866800141 is about 953.4684444944.

The spelling of 866800141 in words is "eight hundred sixty-six million, eight hundred thousand, one hundred forty-one".