11943983813 has 4 divisors (see below), whose sum is σ = 12572614560. Its totient is φ = 11315353068.

The previous prime is 11943983803. The next prime is 11943983827. The reversal of 11943983813 is 31838934911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11943983813 - 2⁶ = 11943983749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11943983803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314315345 + ... + 314315382.

It is an arithmetic number, because the mean of its divisors is an integer number (3143153640).

Almost surely, 2^11943983813 is an apocalyptic number.

It is an amenable number.

11943983813 is a deficient number, since it is larger than the sum of its proper divisors (628630747).

11943983813 is an equidigital number, since it uses as much as digits as its factorization.

11943983813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628630746.

The product of its digits is 559872, while the sum is 50.

The spelling of 11943983813 in words is "eleven billion, nine hundred forty-three million, nine hundred eighty-three thousand, eight hundred thirteen".