12128513 has 2 divisors, whose sum is σ = 12128514. Its totient is φ = 12128512.

The previous prime is 12128509. The next prime is 12128561. The reversal of 12128513 is 31582121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7772944 + 4355569 = 2788^2 + 2087^2 .

It is an emirp because it is prime and its reverse (31582121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12128513 - 2² = 12128509 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12128113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6064256 + 6064257.

It is an arithmetic number, because the mean of its divisors is an integer number (6064257).

Almost surely, 2^12128513 is an apocalyptic number.

It is an amenable number.

12128513 is a deficient number, since it is larger than the sum of its proper divisors (1).

12128513 is an equidigital number, since it uses as much as digits as its factorization.

12128513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 23.

The square root of 12128513 is about 3482.6014701657. The cubic root of 12128513 is about 229.7572296627.

The spelling of 12128513 in words is "twelve million, one hundred twenty-eight thousand, five hundred thirteen".