12780613 has 2 divisors, whose sum is σ = 12780614. Its totient is φ = 12780612.

The previous prime is 12780611. The next prime is 12780629. The reversal of 12780613 is 31608721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12517444 + 263169 = 3538^2 + 513^2 .

It is an emirp because it is prime and its reverse (31608721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12780613 - 2¹ = 12780611 is a prime.

Together with 12780611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12780611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6390306 + 6390307.

It is an arithmetic number, because the mean of its divisors is an integer number (6390307).

Almost surely, 2^12780613 is an apocalyptic number.

It is an amenable number.

12780613 is a deficient number, since it is larger than the sum of its proper divisors (1).

12780613 is an equidigital number, since it uses as much as digits as its factorization.

12780613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 12780613 is about 3574.9983216779. The cubic root of 12780613 is about 233.8032595237.

It can be divided in two parts, 12 and 780613, that added together give a triangular number (780625 = T₁₂₄₉).

The spelling of 12780613 in words is "twelve million, seven hundred eighty thousand, six hundred thirteen".