11166521 has 4 divisors (see below), whose sum is σ = 11177700. Its totient is φ = 11155344.

The previous prime is 11166503. The next prime is 11166559. The reversal of 11166521 is 12566111.

11166521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12566111 = 17 ⋅739183.

It can be written as a sum of positive squares in 2 ways, for example, as 1155625 + 10010896 = 1075^2 + 3164^2 .

It is a cyclic number.

It is not a de Polignac number, because 11166521 - 2⁶ = 11166457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11166581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3926 + ... + 6143.

It is an arithmetic number, because the mean of its divisors is an integer number (2794425).

Almost surely, 2^11166521 is an apocalyptic number.

It is an amenable number.

11166521 is a deficient number, since it is larger than the sum of its proper divisors (11179).

11166521 is a wasteful number, since it uses less digits than its factorization.

11166521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11178.

The product of its digits is 360, while the sum is 23.

The square root of 11166521 is about 3341.6344803105. The cubic root of 11166521 is about 223.5146338514.

The spelling of 11166521 in words is "eleven million, one hundred sixty-six thousand, five hundred twenty-one".