12610781 has 2 divisors, whose sum is σ = 12610782. Its totient is φ = 12610780.

The previous prime is 12610777. The next prime is 12610789. The reversal of 12610781 is 18701621.

12610781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12602500 + 8281 = 3550^2 + 91^2 .

It is an emirp because it is prime and its reverse (18701621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12610781 - 2² = 12610777 is a prime.

It is a super-2 number, since 2×12610781² = 318063594859922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12610781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12610789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6305390 + 6305391.

It is an arithmetic number, because the mean of its divisors is an integer number (6305391).

Almost surely, 2^12610781 is an apocalyptic number.

It is an amenable number.

12610781 is a deficient number, since it is larger than the sum of its proper divisors (1).

12610781 is an equidigital number, since it uses as much as digits as its factorization.

12610781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 12610781 is about 3551.1661464933. The cubic root of 12610781 is about 232.7630260261.

The spelling of 12610781 in words is "twelve million, six hundred ten thousand, seven hundred eighty-one".