13581493 has 2 divisors, whose sum is σ = 13581494. Its totient is φ = 13581492.

The previous prime is 13581481. The next prime is 13581497. The reversal of 13581493 is 39418531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11573604 + 2007889 = 3402^2 + 1417^2 .

It is an emirp because it is prime and its reverse (39418531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13581493 - 2⁹ = 13580981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13581497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6790746 + 6790747.

It is an arithmetic number, because the mean of its divisors is an integer number (6790747).

Almost surely, 2^13581493 is an apocalyptic number.

It is an amenable number.

13581493 is a deficient number, since it is larger than the sum of its proper divisors (1).

13581493 is an equidigital number, since it uses as much as digits as its factorization.

13581493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The square root of 13581493 is about 3685.3077212086. The cubic root of 13581493 is about 238.5883157379.

The spelling of 13581493 in words is "thirteen million, five hundred eighty-one thousand, four hundred ninety-three".