861211 has 8 divisors (see below), whose sum is σ = 957824. Its totient is φ = 768960.

The previous prime is 861199. The next prime is 861221. The reversal of 861211 is 112168.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 861211 - 2⁷ = 861083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666 + ... + 1471.

It is an arithmetic number, because the mean of its divisors is an integer number (119728).

2⁸⁶¹²¹¹ is an apocalyptic number.

861211 is a deficient number, since it is larger than the sum of its proper divisors (96613).

861211 is a wasteful number, since it uses less digits than its factorization.

861211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181.

The product of its digits is 96, while the sum is 19.

The square root of 861211 is about 928.0145472998. The cubic root of 861211 is about 95.1414697421.

Adding to 861211 its reverse (112168), we get a palindrome (973379).

The spelling of 861211 in words is "eight hundred sixty-one thousand, two hundred eleven".