861199 has 2 divisors, whose sum is σ = 861200. Its totient is φ = 861198.

The previous prime is 861191. The next prime is 861221. The reversal of 861199 is 991168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861199 - 2³ = 861191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430599 + 430600.

It is an arithmetic number, because the mean of its divisors is an integer number (430600).

2⁸⁶¹¹⁹⁹ is an apocalyptic number.

861199 is a deficient number, since it is larger than the sum of its proper divisors (1).

861199 is an equidigital number, since it uses as much as digits as its factorization.

861199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 34.

The square root of 861199 is about 928.0080818614. The cubic root of 861199 is about 95.1410278438.

The spelling of 861199 in words is "eight hundred sixty-one thousand, one hundred ninety-nine".