973521 has 12 divisors (see below), whose sum is σ = 1467648. Its totient is φ = 620664.

The previous prime is 973487. The next prime is 973523. The reversal of 973521 is 125379.

It is not a de Polignac number, because 973521 - 2¹¹ = 971473 is a prime.

973521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (973523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2145 + ... + 2558.

It is an arithmetic number, because the mean of its divisors is an integer number (122304).

2⁹⁷³⁵²¹ is an apocalyptic number.

It is an amenable number.

973521 is a deficient number, since it is larger than the sum of its proper divisors (494127).

973521 is a wasteful number, since it uses less digits than its factorization.

973521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4732 (or 4729 counting only the distinct ones).

The product of its digits is 1890, while the sum is 27.

The square root of 973521 is about 986.6716779152. The cubic root of 973521 is about 99.1094595862.

The spelling of 973521 in words is "nine hundred seventy-three thousand, five hundred twenty-one".