871647551 has 4 divisors (see below), whose sum is σ = 871707072. Its totient is φ = 871588032.

The previous prime is 871647503. The next prime is 871647559. The reversal of 871647551 is 155746178.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-871647551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871647559) 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, 9266 + ... + 42768.

It is an arithmetic number, because the mean of its divisors is an integer number (217926768).

Almost surely, 2^871647551 is an apocalyptic number.

871647551 is a deficient number, since it is larger than the sum of its proper divisors (59521).

871647551 is a wasteful number, since it uses less digits than its factorization.

871647551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59520.

The product of its digits is 235200, while the sum is 44.

The square root of 871647551 is about 29523.6778027400. The cubic root of 871647551 is about 955.2425034040.

The spelling of 871647551 in words is "eight hundred seventy-one million, six hundred forty-seven thousand, five hundred fifty-one".