1131320778943 has 2 divisors, whose sum is σ = 1131320778944. Its totient is φ = 1131320778942.

The previous prime is 1131320778923. The next prime is 1131320778979. The reversal of 1131320778943 is 3498770231311.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1131320778943 - 2²¹ = 1131318681791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131320778923) 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, 565660389471 + 565660389472.

It is an arithmetic number, because the mean of its divisors is an integer number (565660389472).

Almost surely, 2^{1131320778943} is an apocalyptic number.

1131320778943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131320778943 is an equidigital number, since it uses as much as digits as its factorization.

1131320778943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 49.

The spelling of 1131320778943 in words is "one trillion, one hundred thirty-one billion, three hundred twenty million, seven hundred seventy-eight thousand, nine hundred forty-three".