871726521 has 8 divisors (see below), whose sum is σ = 1162440544. Its totient is φ = 581081760.

The previous prime is 871726489. The next prime is 871726523. The reversal of 871726521 is 125627178.

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

It is not a de Polignac number, because 871726521 - 2⁵ = 871726489 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 871726521.

It is not an unprimeable number, because it can be changed into a prime (871726523) 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, 32670 + ... + 53016.

It is an arithmetic number, because the mean of its divisors is an integer number (145305068).

Almost surely, 2^871726521 is an apocalyptic number.

It is an amenable number.

871726521 is a deficient number, since it is larger than the sum of its proper divisors (290714023).

871726521 is a wasteful number, since it uses less digits than its factorization.

871726521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34631.

The product of its digits is 47040, while the sum is 39.

The square root of 871726521 is about 29525.0151735778. The cubic root of 871726521 is about 955.2713503932.

The spelling of 871726521 in words is "eight hundred seventy-one million, seven hundred twenty-six thousand, five hundred twenty-one".