1200323909 has 2 divisors, whose sum is σ = 1200323910. Its totient is φ = 1200323908.

The previous prime is 1200323899. The next prime is 1200323911. The reversal of 1200323909 is 9093230021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 807412225 + 392911684 = 28415^2 + 19822^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200323909 - 2⁴ = 1200323893 is a prime.

Together with 1200323911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200323939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600161954 + 600161955.

It is an arithmetic number, because the mean of its divisors is an integer number (600161955).

Almost surely, 2^1200323909 is an apocalyptic number.

It is an amenable number.

1200323909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200323909 is an equidigital number, since it uses as much as digits as its factorization.

1200323909 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 1200323909 is about 34645.6910596397. The cubic root of 1200323909 is about 1062.7541729908.

The spelling of 1200323909 in words is "one billion, two hundred million, three hundred twenty-three thousand, nine hundred nine".