11545821 has 30 divisors (see below), whose sum is σ = 20070270. Its totient is φ = 6595344.

The previous prime is 11545817. The next prime is 11545829. The reversal of 11545821 is 12854511.

11545821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11148921 + 396900 = 3339^2 + 630^2 .

It is not a de Polignac number, because 11545821 - 2² = 11545817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11545829) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 2515 + ... + 5423.

It is an arithmetic number, because the mean of its divisors is an integer number (669009).

Almost surely, 2^11545821 is an apocalyptic number.

It is an amenable number.

11545821 is a deficient number, since it is larger than the sum of its proper divisors (8524449).

11545821 is an equidigital number, since it uses as much as digits as its factorization.

11545821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2935 (or 2919 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The square root of 11545821 is about 3397.9142131608. The cubic root of 11545821 is about 226.0172605399.

The spelling of 11545821 in words is "eleven million, five hundred forty-five thousand, eight hundred twenty-one".