12929981 has 2 divisors, whose sum is σ = 12929982. Its totient is φ = 12929980.

The previous prime is 12929963. The next prime is 12929999. The reversal of 12929981 is 18992921.

It is a balanced prime because it is at equal distance from previous prime (12929963) and next prime (12929999).

It can be written as a sum of positive squares in only one way, i.e., 11628100 + 1301881 = 3410^2 + 1141^2 .

It is a cyclic number.

It is not a de Polignac number, because 12929981 - 2²² = 8735677 is a prime.

It is a super-2 number, since 2×12929981² = 334368817320722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12929941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6464990 + 6464991.

It is an arithmetic number, because the mean of its divisors is an integer number (6464991).

Almost surely, 2^12929981 is an apocalyptic number.

It is an amenable number.

12929981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12929981 is an equidigital number, since it uses as much as digits as its factorization.

12929981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 41.

The square root of 12929981 is about 3595.8282773236. The cubic root of 12929981 is about 234.7105596037.

The spelling of 12929981 in words is "twelve million, nine hundred twenty-nine thousand, nine hundred eighty-one".