861171 has 4 divisors (see below), whose sum is σ = 1148232. Its totient is φ = 574112.

The previous prime is 861167. The next prime is 861191. The reversal of 861171 is 171168.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 861171 - 2² = 861167 is a prime.

It is an Ulam number.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (861121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143526 + ... + 143531.

It is an arithmetic number, because the mean of its divisors is an integer number (287058).

2⁸⁶¹¹⁷¹ is an apocalyptic number.

861171 is a deficient number, since it is larger than the sum of its proper divisors (287061).

861171 is a wasteful number, since it uses less digits than its factorization.

861171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287060.

The product of its digits is 336, while the sum is 24.

The square root of 861171 is about 927.9929956632. The cubic root of 861171 is about 95.1399967319.

The spelling of 861171 in words is "eight hundred sixty-one thousand, one hundred seventy-one".