11543521 has 6 divisors (see below), whose sum is σ = 12688466. Its totient is φ = 10494000.

The previous prime is 11543503. The next prime is 11543549. The reversal of 11543521 is 12534511.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7623121 + 3920400 = 2761^2 + 1980^2 .

It is not a de Polignac number, because 11543521 - 2⁹ = 11543009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11543492 and 11543501.

It is not an unprimeable number, because it can be changed into a prime (11543551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47580 + ... + 47821.

Almost surely, 2^11543521 is an apocalyptic number.

11543521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11543521 is a deficient number, since it is larger than the sum of its proper divisors (1144945).

11543521 is an equidigital number, since it uses as much as digits as its factorization.

11543521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95423 (or 95412 counting only the distinct ones).

The product of its digits is 600, while the sum is 22.

The square root of 11543521 is about 3397.5757533865. The cubic root of 11543521 is about 226.0022515243.

The spelling of 11543521 in words is "eleven million, five hundred forty-three thousand, five hundred twenty-one".