13181393 has 2 divisors, whose sum is σ = 13181394. Its totient is φ = 13181392.

The previous prime is 13181359. The next prime is 13181401. The reversal of 13181393 is 39318131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10452289 + 2729104 = 3233^2 + 1652^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13181393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13181303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6590696 + 6590697.

It is an arithmetic number, because the mean of its divisors is an integer number (6590697).

Almost surely, 2^13181393 is an apocalyptic number.

It is an amenable number.

13181393 is a deficient number, since it is larger than the sum of its proper divisors (1).

13181393 is an equidigital number, since it uses as much as digits as its factorization.

13181393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 29.

The square root of 13181393 is about 3630.6188177775. The cubic root of 13181393 is about 236.2220511342. Note that the first 3 decimals are identical.

The spelling of 13181393 in words is "thirteen million, one hundred eighty-one thousand, three hundred ninety-three".