11531321 has 8 divisors (see below), whose sum is σ = 12259584. Its totient is φ = 10808640.

The previous prime is 11531269. The next prime is 11531339. The reversal of 11531321 is 12313511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11531321 - 2¹⁰ = 11530297 is a prime.

It is a super-4 number, since 4×11531321⁴ (a number of 29 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 11531321.

It is not an unprimeable number, because it can be changed into a prime (11531371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3356 + ... + 5858.

It is an arithmetic number, because the mean of its divisors is an integer number (1532448).

Almost surely, 2^11531321 is an apocalyptic number.

It is an amenable number.

11531321 is a deficient number, since it is larger than the sum of its proper divisors (728263).

11531321 is a wasteful number, since it uses less digits than its factorization.

11531321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791.

The product of its digits is 90, while the sum is 17.

The square root of 11531321 is about 3395.7798809699. The cubic root of 11531321 is about 225.9226051327.

Adding to 11531321 its reverse (12313511), we get a palindrome (23844832).

The spelling of 11531321 in words is "eleven million, five hundred thirty-one thousand, three hundred twenty-one".