12981145 has 4 divisors (see below), whose sum is σ = 15577380. Its totient is φ = 10384912.

The previous prime is 12981113. The next prime is 12981151. The reversal of 12981145 is 54118921.

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 2347024 + 10634121 = 1532^2 + 3261^2 .

It is a cyclic number.

It is not a de Polignac number, because 12981145 - 2⁵ = 12981113 is a prime.

It is a super-2 number, since 2×12981145² = 337020251022050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1298110 + ... + 1298119.

It is an arithmetic number, because the mean of its divisors is an integer number (3894345).

Almost surely, 2^12981145 is an apocalyptic number.

It is an amenable number.

12981145 is a deficient number, since it is larger than the sum of its proper divisors (2596235).

12981145 is an equidigital number, since it uses as much as digits as its factorization.

12981145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596234.

The product of its digits is 2880, while the sum is 31.

The square root of 12981145 is about 3602.9356086392. The cubic root of 12981145 is about 235.0197357803.

The spelling of 12981145 in words is "twelve million, nine hundred eighty-one thousand, one hundred forty-five".