12181493 has 2 divisors, whose sum is σ = 12181494. Its totient is φ = 12181492.

The previous prime is 12181483. The next prime is 12181523. The reversal of 12181493 is 39418121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11957764 + 223729 = 3458^2 + 473^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12181493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12181423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6090746 + 6090747.

It is an arithmetic number, because the mean of its divisors is an integer number (6090747).

Almost surely, 2^12181493 is an apocalyptic number.

It is an amenable number.

12181493 is a deficient number, since it is larger than the sum of its proper divisors (1).

12181493 is an equidigital number, since it uses as much as digits as its factorization.

12181493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 12181493 is about 3490.1995644948. The cubic root of 12181493 is about 230.0912870148.

The spelling of 12181493 in words is "twelve million, one hundred eighty-one thousand, four hundred ninety-three".