8712971639 has 4 divisors (see below), whose sum is σ = 8713174800. Its totient is φ = 8712768480.

The previous prime is 8712971633. The next prime is 8712971647. The reversal of 8712971639 is 9361792178.

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

It is a cyclic number.

It is not a de Polignac number, because 8712971639 - 2³² = 4418004343 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 (8712971633) 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, 9314 + ... + 132335.

It is an arithmetic number, because the mean of its divisors is an integer number (2178293700).

Almost surely, 2^8712971639 is an apocalyptic number.

8712971639 is a deficient number, since it is larger than the sum of its proper divisors (203161).

8712971639 is a wasteful number, since it uses less digits than its factorization.

8712971639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203160.

The product of its digits is 1143072, while the sum is 53.

The square root of 8712971639 is about 93343.2999148841. The cubic root of 8712971639 is about 2057.7317887261.

The spelling of 8712971639 in words is "eight billion, seven hundred twelve million, nine hundred seventy-one thousand, six hundred thirty-nine".