13019871 has 4 divisors (see below), whose sum is σ = 17359832. Its totient is φ = 8679912.

The previous prime is 13019857. The next prime is 13019879. The reversal of 13019871 is 17891031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17891031 = 3 ⋅5963677.

It is not a de Polignac number, because 13019871 - 2⁹ = 13019359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13019879) 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, 2169976 + ... + 2169981.

It is an arithmetic number, because the mean of its divisors is an integer number (4339958).

Almost surely, 2^13019871 is an apocalyptic number.

13019871 is a deficient number, since it is larger than the sum of its proper divisors (4339961).

13019871 is an equidigital number, since it uses as much as digits as its factorization.

13019871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4339960.

The product of its (nonzero) digits is 1512, while the sum is 30.

The square root of 13019871 is about 3608.3058351531. The cubic root of 13019871 is about 235.2532112993.

The spelling of 13019871 in words is "thirteen million, nineteen thousand, eight hundred seventy-one".