971639717 has 4 divisors (see below), whose sum is σ = 971729376. Its totient is φ = 971550060.

The previous prime is 971639699. The next prime is 971639719. The reversal of 971639717 is 717936179.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 971639717 - 2¹⁰ = 971638693 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 (971639719) 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, 25913 + ... + 51134.

It is an arithmetic number, because the mean of its divisors is an integer number (242932344).

Almost surely, 2^971639717 is an apocalyptic number.

It is an amenable number.

971639717 is a deficient number, since it is larger than the sum of its proper divisors (89659).

971639717 is a wasteful number, since it uses less digits than its factorization.

971639717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89658.

The product of its digits is 500094, while the sum is 50.

The square root of 971639717 is about 31171.1359594096. The cubic root of 971639717 is about 990.4557698054.

The spelling of 971639717 in words is "nine hundred seventy-one million, six hundred thirty-nine thousand, seven hundred seventeen".