12499381 has 2 divisors, whose sum is σ = 12499382. Its totient is φ = 12499380.

The previous prime is 12499379. The next prime is 12499439. The reversal of 12499381 is 18399421.

12499381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9205156 + 3294225 = 3034^2 + 1815^2 .

It is an emirp because it is prime and its reverse (18399421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12499381 - 2¹ = 12499379 is a prime.

It is a super-2 number, since 2×12499381² = 312469050766322, which contains 22 as substring.

Together with 12499379, it forms a pair of twin primes.

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 12499381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12499181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6249690 + 6249691.

It is an arithmetic number, because the mean of its divisors is an integer number (6249691).

Almost surely, 2^12499381 is an apocalyptic number.

It is an amenable number.

12499381 is a deficient number, since it is larger than the sum of its proper divisors (1).

12499381 is an equidigital number, since it uses as much as digits as its factorization.

12499381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 12499381 is about 3535.4463650295. The cubic root of 12499381 is about 232.0756107594.

It can be divided in two parts, 12499 and 381, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 12499381 in words is "twelve million, four hundred ninety-nine thousand, three hundred eighty-one".