12509813 has 2 divisors, whose sum is σ = 12509814. Its totient is φ = 12509812.

The previous prime is 12509779. The next prime is 12509831. The reversal of 12509813 is 31890521.

Together with next prime (12509831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11957764 + 552049 = 3458^2 + 743^2 .

It is a cyclic number.

It is not a de Polignac number, because 12509813 - 2¹⁰ = 12508789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12509513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6254906 + 6254907.

It is an arithmetic number, because the mean of its divisors is an integer number (6254907).

Almost surely, 2^12509813 is an apocalyptic number.

It is an amenable number.

12509813 is a deficient number, since it is larger than the sum of its proper divisors (1).

12509813 is an equidigital number, since it uses as much as digits as its factorization.

12509813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 12509813 is about 3536.9214014450. The cubic root of 12509813 is about 232.1401563439.

The spelling of 12509813 in words is "twelve million, five hundred nine thousand, eight hundred thirteen".