11855545 has 16 divisors (see below), whose sum is σ = 16223760. Its totient is φ = 8239104.

The previous prime is 11855531. The next prime is 11855549. The reversal of 11855545 is 54555811.

It can be written as a sum of positive squares in 8 ways, for example, as 1296 + 11854249 = 36^2 + 3443^2 .

It is a cyclic number.

It is not a de Polignac number, because 11855545 - 2⁹ = 11855033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11855545.

It is not an unprimeable number, because it can be changed into a prime (11855549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4260 + ... + 6469.

It is an arithmetic number, because the mean of its divisors is an integer number (1013985).

Almost surely, 2^11855545 is an apocalyptic number.

It is an amenable number.

11855545 is a deficient number, since it is larger than the sum of its proper divisors (4368215).

11855545 is a wasteful number, since it uses less digits than its factorization.

11855545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10764.

The product of its digits is 20000, while the sum is 34.

The square root of 11855545 is about 3443.1882028144. The cubic root of 11855545 is about 228.0204724102.

The spelling of 11855545 in words is "eleven million, eight hundred fifty-five thousand, five hundred forty-five".