13647971 has 4 divisors (see below), whose sum is σ = 13667472. Its totient is φ = 13628472.

The previous prime is 13647929. The next prime is 13648003. The reversal of 13647971 is 17974631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13647971 - 2¹⁴ = 13631587 is a prime.

It is a super-2 number, since 2×13647971² = 372534224833682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13667971) 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, 8660 + ... + 10113.

It is an arithmetic number, because the mean of its divisors is an integer number (3416868).

Almost surely, 2^13647971 is an apocalyptic number.

13647971 is a deficient number, since it is larger than the sum of its proper divisors (19501).

13647971 is an equidigital number, since it uses as much as digits as its factorization.

13647971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19500.

The product of its digits is 31752, while the sum is 38.

The square root of 13647971 is about 3694.3160395397. The cubic root of 13647971 is about 238.9769589664.

The spelling of 13647971 in words is "thirteen million, six hundred forty-seven thousand, nine hundred seventy-one".