13489991 has 4 divisors (see below), whose sum is σ = 13925184. Its totient is φ = 13054800.

The previous prime is 13489963. The next prime is 13490023. The reversal of 13489991 is 19998431.

13489991 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.

It is a cyclic number.

It is not a de Polignac number, because 13489991 - 2¹⁸ = 13227847 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 (13489921) 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, 217550 + ... + 217611.

It is an arithmetic number, because the mean of its divisors is an integer number (3481296).

Almost surely, 2^13489991 is an apocalyptic number.

13489991 is a deficient number, since it is larger than the sum of its proper divisors (435193).

13489991 is an equidigital number, since it uses as much as digits as its factorization.

13489991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435192.

The product of its digits is 69984, while the sum is 44.

The square root of 13489991 is about 3672.8723092425. The cubic root of 13489991 is about 238.0512977015.

The spelling of 13489991 in words is "thirteen million, four hundred eighty-nine thousand, nine hundred ninety-one".