1331329 has 2 divisors, whose sum is σ = 1331330. Its totient is φ = 1331328.

The previous prime is 1331327. The next prime is 1331333. The reversal of 1331329 is 9231331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1327104 + 4225 = 1152^2 + 65^2 .

It is an emirp because it is prime and its reverse (9231331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1331329 - 2¹ = 1331327 is a prime.

Together with 1331327, 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 (1331327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665664 + 665665.

It is an arithmetic number, because the mean of its divisors is an integer number (665665).

2^1331329 is an apocalyptic number.

It is an amenable number.

1331329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331329 is an equidigital number, since it uses as much as digits as its factorization.

1331329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486, while the sum is 22.

The square root of 1331329 is about 1153.8323101734. The cubic root of 1331329 is about 110.0090626142.

The spelling of 1331329 in words is "one million, three hundred thirty-one thousand, three hundred twenty-nine".