871872549 has 4 divisors (see below), whose sum is σ = 1162496736. Its totient is φ = 581248364.

The previous prime is 871872517. The next prime is 871872577. The reversal of 871872549 is 945278178.

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 871872549 - 2⁵ = 871872517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871872509) 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, 145312089 + ... + 145312094.

It is an arithmetic number, because the mean of its divisors is an integer number (290624184).

Almost surely, 2^871872549 is an apocalyptic number.

It is an amenable number.

871872549 is a deficient number, since it is larger than the sum of its proper divisors (290624187).

871872549 is a wasteful number, since it uses less digits than its factorization.

871872549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290624186.

The product of its digits is 1128960, while the sum is 51.

The square root of 871872549 is about 29527.4880238736. The cubic root of 871872549 is about 955.3246884424.

The spelling of 871872549 in words is "eight hundred seventy-one million, eight hundred seventy-two thousand, five hundred forty-nine".