861771 has 4 divisors (see below), whose sum is σ = 1149032. Its totient is φ = 574512.

The previous prime is 861761. The next prime is 861797. The reversal of 861771 is 177168.

861771 is nontrivially palindromic in base 2.

861771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 861771 - 2⁵ = 861739 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 861771.

It is not an unprimeable number, because it can be changed into a prime (861701) 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, 143626 + ... + 143631.

It is an arithmetic number, because the mean of its divisors is an integer number (287258).

2⁸⁶¹⁷⁷¹ is an apocalyptic number.

861771 is a deficient number, since it is larger than the sum of its proper divisors (287261).

861771 is a wasteful number, since it uses less digits than its factorization.

861771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287260.

The product of its digits is 2352, while the sum is 30.

The square root of 861771 is about 928.3162176759. The cubic root of 861771 is about 95.1620870972.

The spelling of 861771 in words is "eight hundred sixty-one thousand, seven hundred seventy-one".