13331947 has 4 divisors (see below), whose sum is σ = 13339440. Its totient is φ = 13324456.

The previous prime is 13331921. The next prime is 13331957. The reversal of 13331947 is 74913331.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13331947 - 2⁷ = 13331819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13331957) 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, 618 + ... + 5200.

It is an arithmetic number, because the mean of its divisors is an integer number (3334860).

Almost surely, 2^13331947 is an apocalyptic number.

13331947 is a deficient number, since it is larger than the sum of its proper divisors (7493).

13331947 is an equidigital number, since it uses as much as digits as its factorization.

13331947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7492.

The product of its digits is 6804, while the sum is 31.

The square root of 13331947 is about 3651.2938802567. The cubic root of 13331947 is about 237.1180016149.

The spelling of 13331947 in words is "thirteen million, three hundred thirty-one thousand, nine hundred forty-seven".