871234561 has 4 divisors (see below), whose sum is σ = 874018372. Its totient is φ = 868450752.

The previous prime is 871234541. The next prime is 871234579. The reversal of 871234561 is 165432178.

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

It can be written as a sum of positive squares in 2 ways, for example, as 235438336 + 635796225 = 15344^2 + 25215^2 .

It is a cyclic number.

It is not a de Polignac number, because 871234561 - 2¹⁷ = 871103489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 871234561.

It is not an unprimeable number, because it can be changed into a prime (871234541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1391436 + ... + 1392061.

It is an arithmetic number, because the mean of its divisors is an integer number (218504593).

Almost surely, 2^871234561 is an apocalyptic number.

It is an amenable number.

871234561 is a deficient number, since it is larger than the sum of its proper divisors (2783811).

871234561 is a wasteful number, since it uses less digits than its factorization.

871234561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2783810.

The product of its digits is 40320, while the sum is 37.

The square root of 871234561 is about 29516.6827573832. The cubic root of 871234561 is about 955.0916136996.

The spelling of 871234561 in words is "eight hundred seventy-one million, two hundred thirty-four thousand, five hundred sixty-one".