1091611378511 has 2 divisors, whose sum is σ = 1091611378512. Its totient is φ = 1091611378510.

The previous prime is 1091611378441. The next prime is 1091611378537. The reversal of 1091611378511 is 1158731161901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1091611378511 - 2¹⁰ = 1091611377487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091611378591) 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, 545805689255 + 545805689256.

It is an arithmetic number, because the mean of its divisors is an integer number (545805689256).

Almost surely, 2^{1091611378511} is an apocalyptic number.

1091611378511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091611378511 is an equidigital number, since it uses as much as digits as its factorization.

1091611378511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 44.

The spelling of 1091611378511 in words is "one trillion, ninety-one billion, six hundred eleven million, three hundred seventy-eight thousand, five hundred eleven".