11243521 has 4 divisors (see below), whose sum is σ = 11275200. Its totient is φ = 11211844.

The previous prime is 11243509. The next prime is 11243563. The reversal of 11243521 is 12534211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11243521 - 2⁹ = 11243009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11243321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15301 + ... + 16018.

It is an arithmetic number, because the mean of its divisors is an integer number (2818800).

It is a Proth number, since it is equal to 2745 ⋅ 2¹² + 1 and 2745 < 2¹².

Almost surely, 2^11243521 is an apocalyptic number.

It is an amenable number.

11243521 is a deficient number, since it is larger than the sum of its proper divisors (31679).

11243521 is an equidigital number, since it uses as much as digits as its factorization.

11243521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31678.

The product of its digits is 240, while the sum is 19.

The square root of 11243521 is about 3353.1359948562. The cubic root of 11243521 is about 224.0272142212.

Adding to 11243521 its reverse (12534211), we get a palindrome (23777732).

The spelling of 11243521 in words is "eleven million, two hundred forty-three thousand, five hundred twenty-one".