12305981 has 2 divisors, whose sum is σ = 12305982. Its totient is φ = 12305980.

The previous prime is 12305921. The next prime is 12305987. The reversal of 12305981 is 18950321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6205081 + 6100900 = 2491^2 + 2470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12305981 is a prime.

It is a super-2 number, since 2×12305981² = 302874336744722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12305987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6152990 + 6152991.

It is an arithmetic number, because the mean of its divisors is an integer number (6152991).

Almost surely, 2^12305981 is an apocalyptic number.

It is an amenable number.

12305981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12305981 is an equidigital number, since it uses as much as digits as its factorization.

12305981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 12305981 is about 3507.9881698774. The cubic root of 12305981 is about 230.8724332046.

The spelling of 12305981 in words is "twelve million, three hundred five thousand, nine hundred eighty-one".