9671521 has 4 divisors (see below), whose sum is σ = 10240452. Its totient is φ = 9102592.

The previous prime is 9671503. The next prime is 9671527. The reversal of 9671521 is 1251769.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1251769 = 137 ⋅9137.

It can be written as a sum of positive squares in 2 ways, for example, as 8381025 + 1290496 = 2895^2 + 1136^2 .

It is a cyclic number.

It is not a de Polignac number, because 9671521 - 2¹⁵ = 9638753 is a prime.

It is a Duffinian number.

9671521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9671527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284440 + ... + 284473.

It is an arithmetic number, because the mean of its divisors is an integer number (2560113).

Almost surely, 2^9671521 is an apocalyptic number.

It is an amenable number.

9671521 is a deficient number, since it is larger than the sum of its proper divisors (568931).

9671521 is a wasteful number, since it uses less digits than its factorization.

9671521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568930.

The product of its digits is 3780, while the sum is 31.

The square root of 9671521 is about 3109.9069117901. The cubic root of 9671521 is about 213.0582029957.

It can be divided in two parts, 96 and 71521, that added together give a palindrome (71617).

The spelling of 9671521 in words is "nine million, six hundred seventy-one thousand, five hundred twenty-one".