12628181 has 2 divisors, whose sum is σ = 12628182. Its totient is φ = 12628180.

The previous prime is 12628171. The next prime is 12628199. The reversal of 12628181 is 18182621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12460900 + 167281 = 3530^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 12628181 - 2⁶ = 12628117 is a prime.

It is a super-2 number, since 2×12628181² = 318941910737522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12628171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6314090 + 6314091.

It is an arithmetic number, because the mean of its divisors is an integer number (6314091).

Almost surely, 2^12628181 is an apocalyptic number.

It is an amenable number.

12628181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12628181 is an equidigital number, since it uses as much as digits as its factorization.

12628181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 29.

The square root of 12628181 is about 3553.6152014533. The cubic root of 12628181 is about 232.8700301139.

The spelling of 12628181 in words is "twelve million, six hundred twenty-eight thousand, one hundred eighty-one".