13507691 has 4 divisors (see below), whose sum is σ = 13528152. Its totient is φ = 13487232.

The previous prime is 13507643. The next prime is 13507717. The reversal of 13507691 is 19670531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19670531 = 773 ⋅25447.

It is a cyclic number.

It is not a de Polignac number, because 13507691 - 2¹⁰ = 13506667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13507631) 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, 9206 + ... + 10571.

It is an arithmetic number, because the mean of its divisors is an integer number (3382038).

Almost surely, 2^13507691 is an apocalyptic number.

13507691 is a deficient number, since it is larger than the sum of its proper divisors (20461).

13507691 is an equidigital number, since it uses as much as digits as its factorization.

13507691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20460.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 13507691 is about 3675.2810776864. The cubic root of 13507691 is about 238.1553666240.

The spelling of 13507691 in words is "thirteen million, five hundred seven thousand, six hundred ninety-one".