13506989 has 4 divisors (see below), whose sum is σ = 13525500. Its totient is φ = 13488480.

The previous prime is 13506973. The next prime is 13507009. The reversal of 13506989 is 98960531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 293764 + 13213225 = 542^2 + 3635^2 .

It is a cyclic number.

It is not a de Polignac number, because 13506989 - 2⁴ = 13506973 is a prime.

It is a super-2 number, since 2×13506989² = 364877503692242, 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 (13506949) 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, 8114 + ... + 9635.

It is an arithmetic number, because the mean of its divisors is an integer number (3381375).

Almost surely, 2^13506989 is an apocalyptic number.

It is an amenable number.

13506989 is a deficient number, since it is larger than the sum of its proper divisors (18511).

13506989 is an equidigital number, since it uses as much as digits as its factorization.

13506989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18510.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 13506989 is about 3675.1855735459. The cubic root of 13506989 is about 238.1512408766.

The spelling of 13506989 in words is "thirteen million, five hundred six thousand, nine hundred eighty-nine".