971671521 has 8 divisors (see below), whose sum is σ = 1298794464. Its totient is φ = 646164800.

The previous prime is 971671513. The next prime is 971671523. The reversal of 971671521 is 125176179.

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 971671521 - 2³ = 971671513 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 971671521.

It is not an unprimeable number, because it can be changed into a prime (971671523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402651 + ... + 405056.

It is an arithmetic number, because the mean of its divisors is an integer number (162349308).

Almost surely, 2^971671521 is an apocalyptic number.

It is an amenable number.

971671521 is a deficient number, since it is larger than the sum of its proper divisors (327122943).

971671521 is a wasteful number, since it uses less digits than its factorization.

971671521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808111.

The product of its digits is 26460, while the sum is 39.

The square root of 971671521 is about 31171.6461066784. The cubic root of 971671521 is about 990.4665763184.

The spelling of 971671521 in words is "nine hundred seventy-one million, six hundred seventy-one thousand, five hundred twenty-one".