11521520 has 40 divisors (see below), whose sum is σ = 27252720. Its totient is φ = 4528640.

The previous prime is 11521519. The next prime is 11521547. The reversal of 11521520 is 2512511.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×11521520² = 265490846220800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3500 + ... + 5940.

It is an arithmetic number, because the mean of its divisors is an integer number (681318).

Almost surely, 2^11521520 is an apocalyptic number.

11521520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11521520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13626360).

11521520 is an abundant number, since it is smaller than the sum of its proper divisors (15731200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11521520 is a wasteful number, since it uses less digits than its factorization.

11521520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2513 (or 2507 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 11521520 is about 3394.3364594571. The cubic root of 11521520 is about 225.8585796527.

Subtracting from 11521520 its reverse (2512511), we obtain a palindrome (9009009).

The spelling of 11521520 in words is "eleven million, five hundred twenty-one thousand, five hundred twenty".