13219381 has 4 divisors (see below), whose sum is σ = 15107872. Its totient is φ = 11330892.

The previous prime is 13219379. The next prime is 13219391. The reversal of 13219381 is 18391231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18391231 = 1499 ⋅12269.

It is a cyclic number.

It is not a de Polignac number, because 13219381 - 2¹ = 13219379 is a prime.

It is a super-2 number, since 2×13219381² = 349504068046322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13219321) 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 in 3 ways as a sum of consecutive naturals, for example, 944235 + ... + 944248.

It is an arithmetic number, because the mean of its divisors is an integer number (3776968).

Almost surely, 2^13219381 is an apocalyptic number.

It is an amenable number.

13219381 is a deficient number, since it is larger than the sum of its proper divisors (1888491).

13219381 is an equidigital number, since it uses as much as digits as its factorization.

13219381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888490.

The product of its digits is 1296, while the sum is 28.

The square root of 13219381 is about 3635.8466689342. The cubic root of 13219381 is about 236.4487595098.

The spelling of 13219381 in words is "thirteen million, two hundred nineteen thousand, three hundred eighty-one".