13881019 has 4 divisors (see below), whose sum is σ = 13920696. Its totient is φ = 13841344.

The previous prime is 13881017. The next prime is 13881037. The reversal of 13881019 is 91018831.

13881019 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91018831 = 43 ⋅2116717.

It is a cyclic number.

It is not a de Polignac number, because 13881019 - 2¹ = 13881017 is a prime.

It is a super-2 number, since 2×13881019² = 385365376956722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13881013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19309 + ... + 20014.

It is an arithmetic number, because the mean of its divisors is an integer number (3480174).

Almost surely, 2^13881019 is an apocalyptic number.

13881019 is a deficient number, since it is larger than the sum of its proper divisors (39677).

13881019 is an equidigital number, since it uses as much as digits as its factorization.

13881019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39676.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 13881019 is about 3725.7239564949. The cubic root of 13881019 is about 240.3295184311.

The spelling of 13881019 in words is "thirteen million, eight hundred eighty-one thousand, nineteen".