13491647 has 4 divisors (see below), whose sum is σ = 14529480. Its totient is φ = 12453816.

The previous prime is 13491629. The next prime is 13491677. The reversal of 13491647 is 74619431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74619431 = 157 ⋅475283.

It is a cyclic number.

It is not a de Polignac number, because 13491647 - 2¹⁰ = 13490623 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 (13491607) 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, 518897 + ... + 518922.

It is an arithmetic number, because the mean of its divisors is an integer number (3632370).

Almost surely, 2^13491647 is an apocalyptic number.

13491647 is a deficient number, since it is larger than the sum of its proper divisors (1037833).

13491647 is a wasteful number, since it uses less digits than its factorization.

13491647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037832.

The product of its digits is 18144, while the sum is 35.

The square root of 13491647 is about 3673.0977389664. The cubic root of 13491647 is about 238.0610381779.

The spelling of 13491647 in words is "thirteen million, four hundred ninety-one thousand, six hundred forty-seven".