11439521 has 4 divisors (see below), whose sum is σ = 12112452. Its totient is φ = 10766592.

The previous prime is 11439517. The next prime is 11439523. The reversal of 11439521 is 12593411.

11439521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12593411 = 89 ⋅141499.

It can be written as a sum of positive squares in 2 ways, for example, as 4363921 + 7075600 = 2089^2 + 2660^2 .

It is a cyclic number.

It is not a de Polignac number, because 11439521 - 2² = 11439517 is a prime.

It is a super-3 number, since 3×11439521³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11439523) 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, 336440 + ... + 336473.

It is an arithmetic number, because the mean of its divisors is an integer number (3028113).

Almost surely, 2^11439521 is an apocalyptic number.

It is an amenable number.

11439521 is a deficient number, since it is larger than the sum of its proper divisors (672931).

11439521 is an equidigital number, since it uses as much as digits as its factorization.

11439521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672930.

The product of its digits is 1080, while the sum is 26.

The square root of 11439521 is about 3382.2360946569. The cubic root of 11439521 is about 225.3214893949.

The spelling of 11439521 in words is "eleven million, four hundred thirty-nine thousand, five hundred twenty-one".