13491687 has 16 divisors (see below), whose sum is σ = 19693440. Its totient is φ = 8148000.

The previous prime is 13491677. The next prime is 13491689. The reversal of 13491687 is 78619431.

It is not a de Polignac number, because 13491687 - 2¹⁵ = 13458919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13491689) 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 15 ways as a sum of consecutive naturals, for example, 12312 + ... + 13362.

It is an arithmetic number, because the mean of its divisors is an integer number (1230840).

Almost surely, 2^13491687 is an apocalyptic number.

13491687 is a deficient number, since it is larger than the sum of its proper divisors (6201753).

13491687 is a wasteful number, since it uses less digits than its factorization.

13491687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454.

The product of its digits is 36288, while the sum is 39.

The square root of 13491687 is about 3673.1031839577. The cubic root of 13491687 is about 238.0612734453.

The spelling of 13491687 in words is "thirteen million, four hundred ninety-one thousand, six hundred eighty-seven".