13231919 has 4 divisors (see below), whose sum is σ = 13242720. Its totient is φ = 13221120.

The previous prime is 13231913. The next prime is 13231921. The reversal of 13231919 is 91913231.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 91913231 = 43 ⋅2137517.

It is a cyclic number.

It is not a de Polignac number, because 13231919 - 2¹⁶ = 13166383 is a prime.

It is a super-2 number, since 2×13231919² = 350167360845122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13231891 and 13231900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231913) 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, 3287 + ... + 6104.

It is an arithmetic number, because the mean of its divisors is an integer number (3310680).

Almost surely, 2^13231919 is an apocalyptic number.

13231919 is a deficient number, since it is larger than the sum of its proper divisors (10801).

13231919 is an equidigital number, since it uses as much as digits as its factorization.

13231919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10800.

The product of its digits is 1458, while the sum is 29.

The square root of 13231919 is about 3637.5704804168. The cubic root of 13231919 is about 236.5234896296.

The spelling of 13231919 in words is "thirteen million, two hundred thirty-one thousand, nine hundred nineteen".