1331020289 has 2 divisors, whose sum is σ = 1331020290. Its totient is φ = 1331020288.

The previous prime is 1331020261. The next prime is 1331020291. The reversal of 1331020289 is 9820201331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 807525889 + 523494400 = 28417^2 + 22880^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331020289 - 2¹⁶ = 1330954753 is a prime.

Together with 1331020291, 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 (1331020259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665510144 + 665510145.

It is an arithmetic number, because the mean of its divisors is an integer number (665510145).

Almost surely, 2^1331020289 is an apocalyptic number.

It is an amenable number.

1331020289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331020289 is an equidigital number, since it uses as much as digits as its factorization.

1331020289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1331020289 is about 36483.1507548348. The cubic root of 1331020289 is about 1100.0055892278.

The spelling of 1331020289 in words is "one billion, three hundred thirty-one million, twenty thousand, two hundred eighty-nine".