12085981 has 2 divisors, whose sum is σ = 12085982. Its totient is φ = 12085980.

The previous prime is 12085979. The next prime is 12085987. The reversal of 12085981 is 18958021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9865881 + 2220100 = 3141^2 + 1490^2 .

It is an emirp because it is prime and its reverse (18958021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12085981 - 2¹ = 12085979 is a prime.

It is a super-2 number, since 2×12085981² = 292141873464722, which contains 22 as substring.

Together with 12085979, 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 (12085987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6042990 + 6042991.

It is an arithmetic number, because the mean of its divisors is an integer number (6042991).

Almost surely, 2^12085981 is an apocalyptic number.

It is an amenable number.

12085981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12085981 is an equidigital number, since it uses as much as digits as its factorization.

12085981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 12085981 is about 3476.4897526097. The cubic root of 12085981 is about 229.4883459289.

The spelling of 12085981 in words is "twelve million, eighty-five thousand, nine hundred eighty-one".