1320220001 has 2 divisors, whose sum is σ = 1320220002. Its totient is φ = 1320220000.

The previous prime is 1320219947. The next prime is 1320220009. The reversal of 1320220001 is 1000220231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1061782225 + 258437776 = 32585^2 + 16076^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320220001 - 2¹⁴ = 1320203617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1320220009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660110000 + 660110001.

It is an arithmetic number, because the mean of its divisors is an integer number (660110001).

Almost surely, 2^1320220001 is an apocalyptic number.

It is an amenable number.

1320220001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320220001 is an equidigital number, since it uses as much as digits as its factorization.

1320220001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1320220001 is about 36334.8317871433. The cubic root of 1320220001 is about 1097.0222496732.

Adding to 1320220001 its reverse (1000220231), we get a palindrome (2320440232).

The spelling of 1320220001 in words is "one billion, three hundred twenty million, two hundred twenty thousand, one".