1011209939 has 2 divisors, whose sum is σ = 1011209940. Its totient is φ = 1011209938.

The previous prime is 1011209917. The next prime is 1011209971. The reversal of 1011209939 is 9399021101.

It is a weak prime.

It is an emirp because it is prime and its reverse (9399021101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1011209939 - 2¹⁶ = 1011144403 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1011209899 and 1011209908.

It is not a weakly prime, because it can be changed into another prime (1011209539) 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, 505604969 + 505604970.

It is an arithmetic number, because the mean of its divisors is an integer number (505604970).

Almost surely, 2^1011209939 is an apocalyptic number.

1011209939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011209939 is an equidigital number, since it uses as much as digits as its factorization.

1011209939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 1011209939 is about 31799.5273392546. The cubic root of 1011209939 is about 1003.7227701180.

The spelling of 1011209939 in words is "one billion, eleven million, two hundred nine thousand, nine hundred thirty-nine".