13516991 has 4 divisors (see below), whose sum is σ = 13623552. Its totient is φ = 13410432.

The previous prime is 13516963. The next prime is 13517011. The reversal of 13516991 is 19961531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19961531 = 3169 ⋅6299.

It is a cyclic number.

It is not a de Polignac number, because 13516991 - 2⁶ = 13516927 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 (13516891) 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, 53090 + ... + 53343.

It is an arithmetic number, because the mean of its divisors is an integer number (3405888).

Almost surely, 2^13516991 is an apocalyptic number.

13516991 is a deficient number, since it is larger than the sum of its proper divisors (106561).

13516991 is a wasteful number, since it uses less digits than its factorization.

13516991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106560.

The product of its digits is 7290, while the sum is 35.

The square root of 13516991 is about 3676.5460693428. The cubic root of 13516991 is about 238.2100104759.

The spelling of 13516991 in words is "thirteen million, five hundred sixteen thousand, nine hundred ninety-one".