12455981 has 2 divisors, whose sum is σ = 12455982. Its totient is φ = 12455980.

The previous prime is 12455969. The next prime is 12455983. The reversal of 12455981 is 18955421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9424900 + 3031081 = 3070^2 + 1741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12455981 is a prime.

It is a super-2 number, since 2×12455981² = 310302925344722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 12455983, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12455983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6227990 + 6227991.

It is an arithmetic number, because the mean of its divisors is an integer number (6227991).

Almost surely, 2^12455981 is an apocalyptic number.

It is an amenable number.

12455981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12455981 is an equidigital number, since it uses as much as digits as its factorization.

12455981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 35.

The square root of 12455981 is about 3529.3031890162. The cubic root of 12455981 is about 231.8066971394.

The spelling of 12455981 in words is "twelve million, four hundred fifty-five thousand, nine hundred eighty-one".