12511945 has 4 divisors (see below), whose sum is σ = 15014340. Its totient is φ = 10009552.

The previous prime is 12511909. The next prime is 12511951. The reversal of 12511945 is 54911521.

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 4822416 + 7689529 = 2196^2 + 2773^2 .

It is a cyclic number.

It is not a de Polignac number, because 12511945 - 2¹³ = 12503753 is a prime.

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, 1251190 + ... + 1251199.

It is an arithmetic number, because the mean of its divisors is an integer number (3753585).

Almost surely, 2^12511945 is an apocalyptic number.

It is an amenable number.

12511945 is a deficient number, since it is larger than the sum of its proper divisors (2502395).

12511945 is an equidigital number, since it uses as much as digits as its factorization.

12511945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502394.

The product of its digits is 1800, while the sum is 28.

The square root of 12511945 is about 3537.2227806572. Note that the first 3 decimals coincide. The cubic root of 12511945 is about 232.1533431837.

It can be divided in two parts, 12511 and 945, that added together give a square (13456 = 116²).

The spelling of 12511945 in words is "twelve million, five hundred eleven thousand, nine hundred forty-five".