971656621 has 8 divisors (see below), whose sum is σ = 1056180384. Its totient is φ = 888530160.

The previous prime is 971656541. The next prime is 971656627. The reversal of 971656621 is 126656179.

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

It is a cyclic number.

It is not a de Polignac number, because 971656621 - 2⁹ = 971656109 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 (971656627) 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, 347875 + ... + 350656.

It is an arithmetic number, because the mean of its divisors is an integer number (132022548).

Almost surely, 2^971656621 is an apocalyptic number.

It is an amenable number.

971656621 is a deficient number, since it is larger than the sum of its proper divisors (84523763).

971656621 is a wasteful number, since it uses less digits than its factorization.

971656621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698651.

The product of its digits is 136080, while the sum is 43.

The square root of 971656621 is about 31171.4071065135. The cubic root of 971656621 is about 990.4615135555.

The spelling of 971656621 in words is "nine hundred seventy-one million, six hundred fifty-six thousand, six hundred twenty-one".