11523145 has 4 divisors (see below), whose sum is σ = 13827780. Its totient is φ = 9218512.

The previous prime is 11523143. The next prime is 11523157. The reversal of 11523145 is 54132511.

It is a happy number.

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 6411024 + 5112121 = 2532^2 + 2261^2 .

It is a cyclic number.

It is not a de Polignac number, because 11523145 - 2¹ = 11523143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11523143) 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, 1152310 + ... + 1152319.

It is an arithmetic number, because the mean of its divisors is an integer number (3456945).

Almost surely, 2^11523145 is an apocalyptic number.

It is an amenable number.

11523145 is a deficient number, since it is larger than the sum of its proper divisors (2304635).

11523145 is an equidigital number, since it uses as much as digits as its factorization.

11523145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304634.

The product of its digits is 600, while the sum is 22.

The square root of 11523145 is about 3394.5758203346. The cubic root of 11523145 is about 225.8691975497.

Adding to 11523145 its reverse (54132511), we get a palindrome (65655656).

The spelling of 11523145 in words is "eleven million, five hundred twenty-three thousand, one hundred forty-five".