12990181 has 2 divisors, whose sum is σ = 12990182. Its totient is φ = 12990180.

The previous prime is 12990179. The next prime is 12990191. The reversal of 12990181 is 18109921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11621281 + 1368900 = 3409^2 + 1170^2 .

It is a cyclic number.

It is not a de Polignac number, because 12990181 - 2¹ = 12990179 is a prime.

It is a super-2 number, since 2×12990181² = 337489604825522, which contains 22 as substring.

Together with 12990179, 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 (12990151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6495090 + 6495091.

It is an arithmetic number, because the mean of its divisors is an integer number (6495091).

Almost surely, 2^12990181 is an apocalyptic number.

It is an amenable number.

12990181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12990181 is an equidigital number, since it uses as much as digits as its factorization.

12990181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 12990181 is about 3604.1893679439. The cubic root of 12990181 is about 235.0742544887.

The spelling of 12990181 in words is "twelve million, nine hundred ninety thousand, one hundred eighty-one".