11511145 has 4 divisors (see below), whose sum is σ = 13813380. Its totient is φ = 9208912.

The previous prime is 11511139. The next prime is 11511191. The reversal of 11511145 is 54111511.

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 7778521 + 3732624 = 2789^2 + 1932^2 .

It is a cyclic number.

It is not a de Polignac number, because 11511145 - 2⁵ = 11511113 is a prime.

It is a super-2 number, since 2×11511145² = 265012918422050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151110 + ... + 1151119.

It is an arithmetic number, because the mean of its divisors is an integer number (3453345).

Almost surely, 2^11511145 is an apocalyptic number.

It is an amenable number.

11511145 is a deficient number, since it is larger than the sum of its proper divisors (2302235).

11511145 is an equidigital number, since it uses as much as digits as its factorization.

11511145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302234.

The product of its digits is 100, while the sum is 19.

The square root of 11511145 is about 3392.8078342282. The cubic root of 11511145 is about 225.7907649175.

Adding to 11511145 its reverse (54111511), we get a palindrome (65622656).

The spelling of 11511145 in words is "eleven million, five hundred eleven thousand, one hundred forty-five".