13217989 has 4 divisors (see below), whose sum is σ = 13227040. Its totient is φ = 13208940.

The previous prime is 13217969. The next prime is 13218019. The reversal of 13217989 is 98971231.

13217989 = T₂₉₆₇ + T₂₉₆₈ + T₂₉₆₉.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13217989 - 2⁵ = 13217957 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 (13217909) 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, 1779 + ... + 5440.

It is an arithmetic number, because the mean of its divisors is an integer number (3306760).

Almost surely, 2^13217989 is an apocalyptic number.

13217989 is the 2969-th centered triangular number.

It is an amenable number.

13217989 is a deficient number, since it is larger than the sum of its proper divisors (9051).

13217989 is an equidigital number, since it uses as much as digits as its factorization.

13217989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9050.

The product of its digits is 27216, while the sum is 40.

The square root of 13217989 is about 3635.6552366802. The cubic root of 13217989 is about 236.4404598719.

The spelling of 13217989 in words is "thirteen million, two hundred seventeen thousand, nine hundred eighty-nine".