12478981 has 2 divisors, whose sum is σ = 12478982. Its totient is φ = 12478980.

The previous prime is 12478979. The next prime is 12478993. The reversal of 12478981 is 18987421.

It is a happy number.

12478981 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., 11498881 + 980100 = 3391^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 12478981 - 2¹ = 12478979 is a prime.

It is a super-2 number, since 2×12478981² = 311449933596722, which contains 22 as substring.

Together with 12478979, 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 (12478681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6239490 + 6239491.

It is an arithmetic number, because the mean of its divisors is an integer number (6239491).

Almost surely, 2^12478981 is an apocalyptic number.

It is an amenable number.

12478981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12478981 is an equidigital number, since it uses as much as digits as its factorization.

12478981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 40.

The square root of 12478981 is about 3532.5601197998. The cubic root of 12478981 is about 231.9492866263.

The spelling of 12478981 in words is "twelve million, four hundred seventy-eight thousand, nine hundred eighty-one".