1091099381093 has 2 divisors, whose sum is σ = 1091099381094. Its totient is φ = 1091099381092.

The previous prime is 1091099381077. The next prime is 1091099381153. The reversal of 1091099381093 is 3901839901901.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1080337808449 + 10761572644 = 1039393^2 + 103738^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091099381093 - 2⁴ = 1091099381077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091099381033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545549690546 + 545549690547.

It is an arithmetic number, because the mean of its divisors is an integer number (545549690547).

Almost surely, 2^{1091099381093} is an apocalyptic number.

It is an amenable number.

1091099381093 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091099381093 is an equidigital number, since it uses as much as digits as its factorization.

1091099381093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 472392, while the sum is 53.

The spelling of 1091099381093 in words is "one trillion, ninety-one billion, ninety-nine million, three hundred eighty-one thousand, ninety-three".