11345561 has 4 divisors (see below), whose sum is σ = 11622324. Its totient is φ = 11068800.

The previous prime is 11345549. The next prime is 11345563. The reversal of 11345561 is 16554311.

11345561 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1485961 + 9859600 = 1219^2 + 3140^2 .

It is a cyclic number.

It is not a de Polignac number, because 11345561 - 2⁶ = 11345497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11345561.

It is not an unprimeable number, because it can be changed into a prime (11345563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138320 + ... + 138401.

It is an arithmetic number, because the mean of its divisors is an integer number (2905581).

Almost surely, 2^11345561 is an apocalyptic number.

It is an amenable number.

11345561 is a deficient number, since it is larger than the sum of its proper divisors (276763).

11345561 is an equidigital number, since it uses as much as digits as its factorization.

11345561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276762.

The product of its digits is 1800, while the sum is 26.

The square root of 11345561 is about 3368.3172356534. The cubic root of 11345561 is about 224.7028901472.

Adding to 11345561 its reverse (16554311), we get a palindrome (27899872).

The spelling of 11345561 in words is "eleven million, three hundred forty-five thousand, five hundred sixty-one".