12785813 has 2 divisors, whose sum is σ = 12785814. Its totient is φ = 12785812.

The previous prime is 12785807. The next prime is 12785821. The reversal of 12785813 is 31858721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12687844 + 97969 = 3562^2 + 313^2 .

It is a cyclic number.

It is not a de Polignac number, because 12785813 - 2¹⁰ = 12784789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12785863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6392906 + 6392907.

It is an arithmetic number, because the mean of its divisors is an integer number (6392907).

Almost surely, 2^12785813 is an apocalyptic number.

It is an amenable number.

12785813 is a deficient number, since it is larger than the sum of its proper divisors (1).

12785813 is an equidigital number, since it uses as much as digits as its factorization.

12785813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 35.

The square root of 12785813 is about 3575.7255207860. The cubic root of 12785813 is about 233.8349641088.

The spelling of 12785813 in words is "twelve million, seven hundred eighty-five thousand, eight hundred thirteen".