1943381911931 has 2 divisors, whose sum is σ = 1943381911932. Its totient is φ = 1943381911930.

The previous prime is 1943381911873. The next prime is 1943381911981. The reversal of 1943381911931 is 1391191833491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1943381911931 - 2¹⁰ = 1943381910907 is a prime.

It is a super-2 number, since 2×1943381911931² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1943381911981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 971690955965 + 971690955966.

It is an arithmetic number, because the mean of its divisors is an integer number (971690955966).

Almost surely, 2^{1943381911931} is an apocalyptic number.

1943381911931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1943381911931 is an equidigital number, since it uses as much as digits as its factorization.

1943381911931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 53.

The spelling of 1943381911931 in words is "one trillion, nine hundred forty-three billion, three hundred eighty-one million, nine hundred eleven thousand, nine hundred thirty-one".