11840943997 has 2 divisors, whose sum is σ = 11840943998. Its totient is φ = 11840943996.

The previous prime is 11840943949. The next prime is 11840944021. The reversal of 11840943997 is 79934904811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8299027801 + 3541916196 = 91099^2 + 59514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11840943997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11840943937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5920471998 + 5920471999.

It is an arithmetic number, because the mean of its divisors is an integer number (5920471999).

Almost surely, 2^11840943997 is an apocalyptic number.

It is an amenable number.

11840943997 is a deficient number, since it is larger than the sum of its proper divisors (1).

11840943997 is an equidigital number, since it uses as much as digits as its factorization.

11840943997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 11840943997 in words is "eleven billion, eight hundred forty million, nine hundred forty-three thousand, nine hundred ninety-seven".