12007781 has 2 divisors, whose sum is σ = 12007782. Its totient is φ = 12007780.

The previous prime is 12007777. The next prime is 12007783. The reversal of 12007781 is 18770021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11937025 + 70756 = 3455^2 + 266^2 .

It is an emirp because it is prime and its reverse (18770021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12007781 - 2² = 12007777 is a prime.

It is a super-2 number, since 2×12007781² = 288373609087922, which contains 22 as substring.

Together with 12007783, it forms a pair of twin primes.

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 12007781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12007783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6003890 + 6003891.

It is an arithmetic number, because the mean of its divisors is an integer number (6003891).

Almost surely, 2^12007781 is an apocalyptic number.

It is an amenable number.

12007781 is a deficient number, since it is larger than the sum of its proper divisors (1).

12007781 is an equidigital number, since it uses as much as digits as its factorization.

12007781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 12007781 is about 3465.2245237502. The cubic root of 12007781 is about 228.9923212721.

The spelling of 12007781 in words is "twelve million, seven thousand, seven hundred eighty-one".