12181523 has 2 divisors, whose sum is σ = 12181524. Its totient is φ = 12181522.

The previous prime is 12181493. The next prime is 12181529. The reversal of 12181523 is 32518121.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (32518121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12181523 - 2¹⁸ = 11919379 is a prime.

It is not a weakly prime, because it can be changed into another prime (12181529) 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, 6090761 + 6090762.

It is an arithmetic number, because the mean of its divisors is an integer number (6090762).

Almost surely, 2^12181523 is an apocalyptic number.

12181523 is a deficient number, since it is larger than the sum of its proper divisors (1).

12181523 is an equidigital number, since it uses as much as digits as its factorization.

12181523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 23.

The square root of 12181523 is about 3490.2038622407. The cubic root of 12181523 is about 230.0914759006.

Adding to 12181523 its reverse (32518121), we get a palindrome (44699644).

It can be divided in two parts, 1218152 and 3, that multiplied together give a triangular number (3654456 = T₂₇₀₃).

The spelling of 12181523 in words is "twelve million, one hundred eighty-one thousand, five hundred twenty-three".