861166 has 16 divisors (see below), whose sum is σ = 1368864. Its totient is φ = 405504.

The previous prime is 861163. The next prime is 861167. The reversal of 861166 is 661168.

861166 is a Rhonda number in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861163) 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, 4366 + ... + 4558.

It is an arithmetic number, because the mean of its divisors is an integer number (85554).

2⁸⁶¹¹⁶⁶ is an apocalyptic number.

861166 is a deficient number, since it is larger than the sum of its proper divisors (507698).

861166 is a wasteful number, since it uses less digits than its factorization.

861166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315.

The product of its digits is 1728, while the sum is 28.

The square root of 861166 is about 927.9903016735. The cubic root of 861166 is about 95.1398126024.

The spelling of 861166 in words is "eight hundred sixty-one thousand, one hundred sixty-six".