9731521 has 8 divisors (see below), whose sum is σ = 9876384. Its totient is φ = 9588000.

The previous prime is 9731509. The next prime is 9731563. The reversal of 9731521 is 1251379.

9731521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 9731521 - 2⁹ = 9731009 is a prime.

It is a Duffinian number.

9731521 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 9731521.

It is not an unprimeable number, because it can be changed into a prime (9731581) 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, 34246 + ... + 34528.

It is an arithmetic number, because the mean of its divisors is an integer number (1234548).

Almost surely, 2^9731521 is an apocalyptic number.

It is an amenable number.

9731521 is a deficient number, since it is larger than the sum of its proper divisors (144863).

9731521 is a wasteful number, since it uses less digits than its factorization.

9731521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671.

The product of its digits is 1890, while the sum is 28.

The square root of 9731521 is about 3119.5385876761. The cubic root of 9731521 is about 213.4978838410.

It can be divided in two parts, 97315 and 21, that added together give a cube (97336 = 46³).

The spelling of 9731521 in words is "nine million, seven hundred thirty-one thousand, five hundred twenty-one".