1242202909 has 2 divisors, whose sum is σ = 1242202910. Its totient is φ = 1242202908.

The previous prime is 1242202901. The next prime is 1242202921. The reversal of 1242202909 is 9092022421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 879300409 + 362902500 = 29653^2 + 19050^2 .

It is an emirp because it is prime and its reverse (9092022421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242202909 - 2³ = 1242202901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242202901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621101454 + 621101455.

It is an arithmetic number, because the mean of its divisors is an integer number (621101455).

Almost surely, 2^1242202909 is an apocalyptic number.

It is an amenable number.

1242202909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242202909 is an equidigital number, since it uses as much as digits as its factorization.

1242202909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1242202909 is about 35244.8990493660. The cubic root of 1242202909 is about 1074.9728953685.

The spelling of 1242202909 in words is "one billion, two hundred forty-two million, two hundred two thousand, nine hundred nine".