12815489 has 2 divisors, whose sum is σ = 12815490. Its totient is φ = 12815488.

The previous prime is 12815471. The next prime is 12815503. The reversal of 12815489 is 98451821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8439025 + 4376464 = 2905^2 + 2092^2 .

It is a cyclic number.

It is not a de Polignac number, because 12815489 - 2¹⁶ = 12749953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12815689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6407744 + 6407745.

It is an arithmetic number, because the mean of its divisors is an integer number (6407745).

Almost surely, 2^12815489 is an apocalyptic number.

It is an amenable number.

12815489 is a deficient number, since it is larger than the sum of its proper divisors (1).

12815489 is an equidigital number, since it uses as much as digits as its factorization.

12815489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 38.

The square root of 12815489 is about 3579.8727631021. The cubic root of 12815489 is about 234.0157354213.

The spelling of 12815489 in words is "twelve million, eight hundred fifteen thousand, four hundred eighty-nine".