1331249 has 2 divisors, whose sum is σ = 1331250. Its totient is φ = 1331248.

The previous prime is 1331243. The next prime is 1331251. The reversal of 1331249 is 9421331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 110224 = 1105^2 + 332^2 .

It is an emirp because it is prime and its reverse (9421331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331249 is a prime.

Together with 1331251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1331243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665624 + 665625.

It is an arithmetic number, because the mean of its divisors is an integer number (665625).

2^1331249 is an apocalyptic number.

It is an amenable number.

1331249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331249 is an equidigital number, since it uses as much as digits as its factorization.

1331249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 23.

The square root of 1331249 is about 1153.7976425700. The cubic root of 1331249 is about 110.0068590764.

The spelling of 1331249 in words is "one million, three hundred thirty-one thousand, two hundred forty-nine".