12581045 has 4 divisors (see below), whose sum is σ = 15097260. Its totient is φ = 10064832.

The previous prime is 12581033. The next prime is 12581047. The reversal of 12581045 is 54018521.

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 1385329 + 11195716 = 1177^2 + 3346^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12581045 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12581047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1258100 + ... + 1258109.

It is an arithmetic number, because the mean of its divisors is an integer number (3774315).

Almost surely, 2^12581045 is an apocalyptic number.

It is an amenable number.

12581045 is a deficient number, since it is larger than the sum of its proper divisors (2516215).

12581045 is an equidigital number, since it uses as much as digits as its factorization.

12581045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2516214.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 12581045 is about 3546.9768817967. The cubic root of 12581045 is about 232.5799316645.

Adding to 12581045 its reverse (54018521), we get a palindrome (66599566).

The spelling of 12581045 in words is "twelve million, five hundred eighty-one thousand, forty-five".