1331247 has 4 divisors (see below), whose sum is σ = 1775000. Its totient is φ = 887496.

The previous prime is 1331243. The next prime is 1331249. The reversal of 1331247 is 7421331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7421331 = 3 ⋅2473777.

It is not a de Polignac number, because 1331247 - 2² = 1331243 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331243) 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, 221872 + ... + 221877.

It is an arithmetic number, because the mean of its divisors is an integer number (443750).

2^1331247 is an apocalyptic number.

1331247 is a deficient number, since it is larger than the sum of its proper divisors (443753).

1331247 is an equidigital number, since it uses as much as digits as its factorization.

1331247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443752.

The product of its digits is 504, while the sum is 21.

The square root of 1331247 is about 1153.7967758665. The cubic root of 1331247 is about 110.0068039868.

Adding to 1331247 its reverse (7421331), we get a palindrome (8752578).

The spelling of 1331247 in words is "one million, three hundred thirty-one thousand, two hundred forty-seven".