1320203909 has 2 divisors, whose sum is σ = 1320203910. Its totient is φ = 1320203908.

The previous prime is 1320203897. The next prime is 1320203959. The reversal of 1320203909 is 9093020231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1260960100 + 59243809 = 35510^2 + 7697^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320203909 - 2⁸ = 1320203653 is a prime.

It is a super-2 number, since 2×1320203909² = 3485876722677760562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320203959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660101954 + 660101955.

It is an arithmetic number, because the mean of its divisors is an integer number (660101955).

Almost surely, 2^1320203909 is an apocalyptic number.

It is an amenable number.

1320203909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320203909 is an equidigital number, since it uses as much as digits as its factorization.

1320203909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 1320203909 is about 36334.6103460599. The cubic root of 1320203909 is about 1097.0177924984.

The spelling of 1320203909 in words is "one billion, three hundred twenty million, two hundred three thousand, nine hundred nine".