13571381 has 2 divisors, whose sum is σ = 13571382. Its totient is φ = 13571380.

The previous prime is 13571353. The next prime is 13571387. The reversal of 13571381 is 18317531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8797156 + 4774225 = 2966^2 + 2185^2 .

It is a cyclic number.

It is not a de Polignac number, because 13571381 - 2¹⁴ = 13554997 is a prime.

It is a super-2 number, since 2×13571381² = 368364764494322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13571387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6785690 + 6785691.

It is an arithmetic number, because the mean of its divisors is an integer number (6785691).

Almost surely, 2^13571381 is an apocalyptic number.

It is an amenable number.

13571381 is a deficient number, since it is larger than the sum of its proper divisors (1).

13571381 is an equidigital number, since it uses as much as digits as its factorization.

13571381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 29.

The square root of 13571381 is about 3683.9355314663. The cubic root of 13571381 is about 238.5290879819.

The spelling of 13571381 in words is "thirteen million, five hundred seventy-one thousand, three hundred eighty-one".