13499991 has 12 divisors (see below), whose sum is σ = 19595160. Its totient is φ = 8956080.

The previous prime is 13499939. The next prime is 13499999. The reversal of 13499991 is 19999431.

It is not a de Polignac number, because 13499991 - 2¹⁴ = 13483607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13499999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1656 + ... + 5453.

It is an arithmetic number, because the mean of its divisors is an integer number (1632930).

Almost surely, 2^13499991 is an apocalyptic number.

13499991 is a deficient number, since it is larger than the sum of its proper divisors (6095169).

13499991 is a wasteful number, since it uses less digits than its factorization.

13499991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7326 (or 7323 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 13499991 is about 3674.2333894297. The cubic root of 13499991 is about 238.1101048818.

The spelling of 13499991 in words is "thirteen million, four hundred ninety-nine thousand, nine hundred ninety-one".