871582261 has 4 divisors (see below), whose sum is σ = 950817024. Its totient is φ = 792347500.

The previous prime is 871582237. The next prime is 871582301. The reversal of 871582261 is 162285178.

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.

It is a cyclic number.

It is not a de Polignac number, because 871582261 - 2¹⁵ = 871549493 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871585261) 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, 39617365 + ... + 39617386.

It is an arithmetic number, because the mean of its divisors is an integer number (237704256).

Almost surely, 2^871582261 is an apocalyptic number.

It is an amenable number.

871582261 is a deficient number, since it is larger than the sum of its proper divisors (79234763).

871582261 is a wasteful number, since it uses less digits than its factorization.

871582261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79234762.

The product of its digits is 53760, while the sum is 40.

The square root of 871582261 is about 29522.5720593582. The cubic root of 871582261 is about 955.2186522728.

The spelling of 871582261 in words is "eight hundred seventy-one million, five hundred eighty-two thousand, two hundred sixty-one".