11527821 has 6 divisors (see below), whose sum is σ = 16651310. Its totient is φ = 7685208.

The previous prime is 11527811. The next prime is 11527823. The reversal of 11527821 is 12872511.

It can be written as a sum of positive squares in only one way, i.e., 11492100 + 35721 = 3390^2 + 189^2 .

It is not a de Polignac number, because 11527821 - 2⁷ = 11527693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11527823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 640426 + ... + 640443.

Almost surely, 2^11527821 is an apocalyptic number.

It is an amenable number.

11527821 is a deficient number, since it is larger than the sum of its proper divisors (5123489).

11527821 is a wasteful number, since it uses less digits than its factorization.

11527821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280875 (or 1280872 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 11527821 is about 3395.2644963243. The cubic root of 11527821 is about 225.8997453888.

The spelling of 11527821 in words is "eleven million, five hundred twenty-seven thousand, eight hundred twenty-one".