1331220220009 has 2 divisors, whose sum is σ = 1331220220010. Its totient is φ = 1331220220008.

The previous prime is 1331220220007. The next prime is 1331220220061. The reversal of 1331220220009 is 9000220221331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1066618003984 + 264602216025 = 1032772^2 + 514395^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331220220009 - 2¹ = 1331220220007 is a prime.

Together with 1331220220007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1331220220007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665610110004 + 665610110005.

It is an arithmetic number, because the mean of its divisors is an integer number (665610110005).

Almost surely, 2^{1331220220009} is an apocalyptic number.

It is an amenable number.

1331220220009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331220220009 is an equidigital number, since it uses as much as digits as its factorization.

1331220220009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 1331220220009 in words is "one trillion, three hundred thirty-one billion, two hundred twenty million, two hundred twenty thousand, nine".