1331947 has 4 divisors (see below), whose sum is σ = 1337760. Its totient is φ = 1326136.

The previous prime is 1331929. The next prime is 1331951. The reversal of 1331947 is 7491331.

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 1331947 - 2¹¹ = 1329899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2548 + ... + 3025.

It is an arithmetic number, because the mean of its divisors is an integer number (334440).

2^1331947 is an apocalyptic number.

1331947 is a deficient number, since it is larger than the sum of its proper divisors (5813).

1331947 is an equidigital number, since it uses as much as digits as its factorization.

1331947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5812.

The product of its digits is 2268, while the sum is 28.

The square root of 1331947 is about 1154.1000823152. The cubic root of 1331947 is about 110.0260819695.

It can be divided in two parts, 13319 and 47, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 1331947 in words is "one million, three hundred thirty-one thousand, nine hundred forty-seven".