11863521 has 6 divisors (see below), whose sum is σ = 17136210. Its totient is φ = 7909008.

The previous prime is 11863519. The next prime is 11863541. The reversal of 11863521 is 12536811.

11863521 is a `hidden beast` number, since 1 + 1 + 8 + 635 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6275025 + 5588496 = 2505^2 + 2364^2 .

It is not a de Polignac number, because 11863521 - 2¹ = 11863519 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11863541) 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 5 ways as a sum of consecutive naturals, for example, 659076 + ... + 659093.

It is an arithmetic number, because the mean of its divisors is an integer number (2856035).

Almost surely, 2^11863521 is an apocalyptic number.

It is an amenable number.

11863521 is a deficient number, since it is larger than the sum of its proper divisors (5272689).

11863521 is a wasteful number, since it uses less digits than its factorization.

11863521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318175 (or 1318172 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 11863521 is about 3444.3462369512. The cubic root of 11863521 is about 228.0715957056.

The spelling of 11863521 in words is "eleven million, eight hundred sixty-three thousand, five hundred twenty-one".