1331345 has 4 divisors (see below), whose sum is σ = 1597620. Its totient is φ = 1065072.

The previous prime is 1331339. The next prime is 1331347. The reversal of 1331345 is 5431331.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 528529 + 802816 = 727^2 + 896^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331345 - 2⁴ = 1331329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1331347) by changing a digit.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133130 + ... + 133139.

It is an arithmetic number, because the mean of its divisors is an integer number (399405).

2^1331345 is an apocalyptic number.

It is an amenable number.

1331345 is a deficient number, since it is larger than the sum of its proper divisors (266275).

1331345 is an equidigital number, since it uses as much as digits as its factorization.

1331345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266274.

The product of its digits is 540, while the sum is 20.

The square root of 1331345 is about 1153.8392435691. The cubic root of 1331345 is about 110.0095033112.

Adding to 1331345 its reverse (5431331), we get a palindrome (6762676).

The spelling of 1331345 in words is "one million, three hundred thirty-one thousand, three hundred forty-five".