11311521 has 8 divisors (see below), whose sum is σ = 16242240. Its totient is φ = 6960912.

The previous prime is 11311519. The next prime is 11311523. The reversal of 11311521 is 12511311.

It is an interprime number because it is at equal distance from previous prime (11311519) and next prime (11311523).

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

It is not a de Polignac number, because 11311521 - 2¹ = 11311519 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11311521.

It is not an unprimeable number, because it can be changed into a prime (11311523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144981 + ... + 145058.

It is an arithmetic number, because the mean of its divisors is an integer number (2030280).

Almost surely, 2^11311521 is an apocalyptic number.

It is an amenable number.

11311521 is a deficient number, since it is larger than the sum of its proper divisors (4930719).

11311521 is a wasteful number, since it uses less digits than its factorization.

11311521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290055.

The product of its digits is 30, while the sum is 15.

The square root of 11311521 is about 3363.2604716257. The cubic root of 11311521 is about 224.4779402368.

Adding to 11311521 its reverse (12511311), we get a palindrome (23822832).

The spelling of 11311521 in words is "eleven million, three hundred eleven thousand, five hundred twenty-one".