861181 has 8 divisors (see below), whose sum is σ = 895104. Its totient is φ = 828000.

The previous prime is 861167. The next prime is 861191. The reversal of 861181 is 181168.

It is a happy number.

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 861181 - 2⁷ = 861053 is a prime.

It is a super-2 number, since 2×861181² = 1483265429522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861121) 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 in 7 ways as a sum of consecutive naturals, for example, 3306 + ... + 3556.

It is an arithmetic number, because the mean of its divisors is an integer number (111888).

2⁸⁶¹¹⁸¹ is an apocalyptic number.

It is an amenable number.

861181 is a deficient number, since it is larger than the sum of its proper divisors (33923).

861181 is a wasteful number, since it uses less digits than its factorization.

861181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371.

The product of its digits is 384, while the sum is 25.

The square root of 861181 is about 927.9983836193. The cubic root of 861181 is about 95.1403649888.

The spelling of 861181 in words is "eight hundred sixty-one thousand, one hundred eighty-one".