12511145 has 4 divisors (see below), whose sum is σ = 15013380. Its totient is φ = 10008912.

The previous prime is 12511141. The next prime is 12511159. The reversal of 12511145 is 54111521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54111521 = 179 ⋅302299.

It can be written as a sum of positive squares in 2 ways, for example, as 1308736 + 11202409 = 1144^2 + 3347^2 .

It is a cyclic number.

It is not a de Polignac number, because 12511145 - 2² = 12511141 is a prime.

It is a super-2 number, since 2×12511145² = 313057498422050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12511141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1251110 + ... + 1251119.

It is an arithmetic number, because the mean of its divisors is an integer number (3753345).

Almost surely, 2^12511145 is an apocalyptic number.

It is an amenable number.

12511145 is a deficient number, since it is larger than the sum of its proper divisors (2502235).

12511145 is an equidigital number, since it uses as much as digits as its factorization.

12511145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502234.

The product of its digits is 200, while the sum is 20.

The square root of 12511145 is about 3537.1096957827. The cubic root of 12511145 is about 232.1483952018.

Adding to 12511145 its reverse (54111521), we get a palindrome (66622666).

The spelling of 12511145 in words is "twelve million, five hundred eleven thousand, one hundred forty-five".