13819381 has 2 divisors, whose sum is σ = 13819382. Its totient is φ = 13819380.

The previous prime is 13819361. The next prime is 13819387. The reversal of 13819381 is 18391831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13256881 + 562500 = 3641^2 + 750^2 .

It is a cyclic number.

It is not a de Polignac number, because 13819381 - 2⁵ = 13819349 is a prime.

It is a super-2 number, since 2×13819381² = 381950582446322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13819387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6909690 + 6909691.

It is an arithmetic number, because the mean of its divisors is an integer number (6909691).

Almost surely, 2^13819381 is an apocalyptic number.

It is an amenable number.

13819381 is a deficient number, since it is larger than the sum of its proper divisors (1).

13819381 is an equidigital number, since it uses as much as digits as its factorization.

13819381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 34.

The square root of 13819381 is about 3717.4428038640. The cubic root of 13819381 is about 239.9732666982.

The spelling of 13819381 in words is "thirteen million, eight hundred nineteen thousand, three hundred eighty-one".