12655381 has 2 divisors, whose sum is σ = 12655382. Its totient is φ = 12655380.

The previous prime is 12655367. The next prime is 12655399. The reversal of 12655381 is 18355621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12460900 + 194481 = 3530^2 + 441^2 .

It is an emirp because it is prime and its reverse (18355621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12655381 is a prime.

It is a super-2 number, since 2×12655381² = 320317336510322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12655481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6327690 + 6327691.

It is an arithmetic number, because the mean of its divisors is an integer number (6327691).

Almost surely, 2^12655381 is an apocalyptic number.

It is an amenable number.

12655381 is a deficient number, since it is larger than the sum of its proper divisors (1).

12655381 is an equidigital number, since it uses as much as digits as its factorization.

12655381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 12655381 is about 3557.4402314023. The cubic root of 12655381 is about 233.0371041256.

The spelling of 12655381 in words is "twelve million, six hundred fifty-five thousand, three hundred eighty-one".