11673521 has 4 divisors (see below), whose sum is σ = 11741172. Its totient is φ = 11605872.

The previous prime is 11673517. The next prime is 11673523. The reversal of 11673521 is 12537611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12537611 = 1321 ⋅9491.

It can be written as a sum of positive squares in 2 ways, for example, as 9541921 + 2131600 = 3089^2 + 1460^2 .

It is a cyclic number.

It is not a de Polignac number, because 11673521 - 2² = 11673517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11673523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33566 + ... + 33911.

It is an arithmetic number, because the mean of its divisors is an integer number (2935293).

Almost surely, 2^11673521 is an apocalyptic number.

It is an amenable number.

11673521 is a deficient number, since it is larger than the sum of its proper divisors (67651).

11673521 is an equidigital number, since it uses as much as digits as its factorization.

11673521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67650.

The product of its digits is 1260, while the sum is 26.

The square root of 11673521 is about 3416.6534796493. The cubic root of 11673521 is about 226.8474785175.

It can be divided in two parts, 116 and 73521, that added together give a palindrome (73637).

The spelling of 11673521 in words is "eleven million, six hundred seventy-three thousand, five hundred twenty-one".