12109381 has 2 divisors, whose sum is σ = 12109382. Its totient is φ = 12109380.

The previous prime is 12109369. The next prime is 12109411. The reversal of 12109381 is 18390121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6421156 + 5688225 = 2534^2 + 2385^2 .

It is a cyclic number.

It is not a de Polignac number, because 12109381 - 2²¹ = 10012229 is a prime.

It is a super-2 number, since 2×12109381² = 293274216406322, which contains 22 as substring.

It is a zygodrome in base 5.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12109681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6054690 + 6054691.

It is an arithmetic number, because the mean of its divisors is an integer number (6054691).

Almost surely, 2^12109381 is an apocalyptic number.

It is an amenable number.

12109381 is a deficient number, since it is larger than the sum of its proper divisors (1).

12109381 is an equidigital number, since it uses as much as digits as its factorization.

12109381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 12109381 is about 3479.8535888741. The cubic root of 12109381 is about 229.6363566788.

The spelling of 12109381 in words is "twelve million, one hundred nine thousand, three hundred eighty-one".