861971 has 8 divisors (see below), whose sum is σ = 981504. Its totient is φ = 749320.

The previous prime is 861947. The next prime is 861977. The reversal of 861971 is 179168.

861971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 861971 - 2⁶ = 861907 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (861977) 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, 1451 + ... + 1956.

It is an arithmetic number, because the mean of its divisors is an integer number (122688).

2⁸⁶¹⁹⁷¹ is an apocalyptic number.

861971 is a deficient number, since it is larger than the sum of its proper divisors (119533).

861971 is a wasteful number, since it uses less digits than its factorization.

861971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3441.

The product of its digits is 3024, while the sum is 32.

The square root of 861971 is about 928.4239333408. The cubic root of 861971 is about 95.1694482737.

The spelling of 861971 in words is "eight hundred sixty-one thousand, nine hundred seventy-one".