13017989 has 4 divisors (see below), whose sum is σ = 13029324. Its totient is φ = 13006656.

The previous prime is 13017967. The next prime is 13018001. The reversal of 13017989 is 98971031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98971031 = 853 ⋅116027.

It can be written as a sum of positive squares in 2 ways, for example, as 9972964 + 3045025 = 3158^2 + 1745^2 .

It is a cyclic number.

It is not a de Polignac number, because 13017989 - 2²⁰ = 11969413 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13017929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3722 + ... + 6315.

It is an arithmetic number, because the mean of its divisors is an integer number (3257331).

Almost surely, 2^13017989 is an apocalyptic number.

It is an amenable number.

13017989 is a deficient number, since it is larger than the sum of its proper divisors (11335).

13017989 is a wasteful number, since it uses less digits than its factorization.

13017989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11334.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 13017989 is about 3608.0450385216. The cubic root of 13017989 is about 235.2418756038.

The spelling of 13017989 in words is "thirteen million, seventeen thousand, nine hundred eighty-nine".