1200242509 has 2 divisors, whose sum is σ = 1200242510. Its totient is φ = 1200242508.

The previous prime is 1200242507. The next prime is 1200242539. The reversal of 1200242509 is 9052420021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1129632100 + 70610409 = 33610^2 + 8403^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200242509 - 2¹ = 1200242507 is a prime.

Together with 1200242507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200242507) 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, 600121254 + 600121255.

It is an arithmetic number, because the mean of its divisors is an integer number (600121255).

Almost surely, 2^1200242509 is an apocalyptic number.

It is an amenable number.

1200242509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200242509 is an equidigital number, since it uses as much as digits as its factorization.

1200242509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1200242509 is about 34644.5162904607. The cubic root of 1200242509 is about 1062.7301488796.

The spelling of 1200242509 in words is "one billion, two hundred million, two hundred forty-two thousand, five hundred nine".