871961 has 4 divisors (see below), whose sum is σ = 886800. Its totient is φ = 857124.

The previous prime is 871957. The next prime is 871963. The reversal of 871961 is 169178.

871961 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 169178 = 2 ⋅84589.

It is a cyclic number.

It is not a de Polignac number, because 871961 - 2² = 871957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 14 and base 15.

It is not an unprimeable number, because it can be changed into a prime (871963) 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, 7331 + ... + 7448.

It is an arithmetic number, because the mean of its divisors is an integer number (221700).

2⁸⁷¹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

871961 is a deficient number, since it is larger than the sum of its proper divisors (14839).

871961 is a wasteful number, since it uses less digits than its factorization.

871961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14838.

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

The square root of 871961 is about 933.7885199551. The cubic root of 871961 is about 95.5356993075.

It can be divided in two parts, 87 and 1961, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 871961 in words is "eight hundred seventy-one thousand, nine hundred sixty-one".