11993238709 has 2 divisors, whose sum is σ = 11993238710. Its totient is φ = 11993238708.

The previous prime is 11993238707. The next prime is 11993238737. The reversal of 11993238709 is 90783239911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10136059684 + 1857179025 = 100678^2 + 43095^2 .

It is a cyclic number.

It is not a de Polignac number, because 11993238709 - 2¹ = 11993238707 is a prime.

Together with 11993238707, 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 (11993238707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5996619354 + 5996619355.

It is an arithmetic number, because the mean of its divisors is an integer number (5996619355).

Almost surely, 2^11993238709 is an apocalyptic number.

It is an amenable number.

11993238709 is a deficient number, since it is larger than the sum of its proper divisors (1).

11993238709 is an equidigital number, since it uses as much as digits as its factorization.

11993238709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 52.

The spelling of 11993238709 in words is "eleven billion, nine hundred ninety-three million, two hundred thirty-eight thousand, seven hundred nine".