1183911565541 has 2 divisors, whose sum is σ = 1183911565542. Its totient is φ = 1183911565540.

The previous prime is 1183911565511. The next prime is 1183911565559. The reversal of 1183911565541 is 1455651193811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1007724861025 + 176186704516 = 1003855^2 + 419746^2 .

It is an emirp because it is prime and its reverse (1455651193811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1183911565541 - 2⁶ = 1183911565477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1183911565541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1183911565511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 591955782770 + 591955782771.

It is an arithmetic number, because the mean of its divisors is an integer number (591955782771).

Almost surely, 2^{1183911565541} is an apocalyptic number.

It is an amenable number.

1183911565541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1183911565541 is an equidigital number, since it uses as much as digits as its factorization.

1183911565541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648000, while the sum is 50.

The spelling of 1183911565541 in words is "one trillion, one hundred eighty-three billion, nine hundred eleven million, five hundred sixty-five thousand, five hundred forty-one".