13081989 has 4 divisors (see below), whose sum is σ = 17442656. Its totient is φ = 8721324.

The previous prime is 13081973. The next prime is 13081997. The reversal of 13081989 is 98918031.

It is a happy number.

13081989 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98918031 = 3 ⋅32972677.

It is not a de Polignac number, because 13081989 - 2⁴ = 13081973 is a prime.

It is a super-2 number, since 2×13081989² = 342276872392242, 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 (13081909) 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, 2180329 + ... + 2180334.

It is an arithmetic number, because the mean of its divisors is an integer number (4360664).

Almost surely, 2^13081989 is an apocalyptic number.

It is an amenable number.

13081989 is a deficient number, since it is larger than the sum of its proper divisors (4360667).

13081989 is an equidigital number, since it uses as much as digits as its factorization.

13081989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4360666.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 13081989 is about 3616.9032334305. The cubic root of 13081989 is about 235.6267500755.

The spelling of 13081989 in words is "thirteen million, eighty-one thousand, nine hundred eighty-nine".