11521005 has 16 divisors (see below), whose sum is σ = 18515904. Its totient is φ = 6117120.

The previous prime is 11520991. The next prime is 11521007. The reversal of 11521005 is 50012511.

It is not a de Polignac number, because 11521005 - 2⁶ = 11520941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11521007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2022 + ... + 5208.

It is an arithmetic number, because the mean of its divisors is an integer number (1157244).

Almost surely, 2^11521005 is an apocalyptic number.

11521005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11521005 is a deficient number, since it is larger than the sum of its proper divisors (6994899).

11521005 is a wasteful number, since it uses less digits than its factorization.

11521005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436.

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 11521005 is about 3394.2605969489. The cubic root of 11521005 is about 225.8552143878.

Adding to 11521005 its reverse (50012511), we get a palindrome (61533516).

The spelling of 11521005 in words is "eleven million, five hundred twenty-one thousand, five".