1091795609 has 2 divisors, whose sum is σ = 1091795610. Its totient is φ = 1091795608.

The previous prime is 1091795599. The next prime is 1091795623. The reversal of 1091795609 is 9065971901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1027843600 + 63952009 = 32060^2 + 7997^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1091795609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1091795659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545897804 + 545897805.

It is an arithmetic number, because the mean of its divisors is an integer number (545897805).

Almost surely, 2^1091795609 is an apocalyptic number.

It is an amenable number.

1091795609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091795609 is an equidigital number, since it uses as much as digits as its factorization.

1091795609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153090, while the sum is 47.

The square root of 1091795609 is about 33042.3305624770. The cubic root of 1091795609 is about 1029.7072750336.

The spelling of 1091795609 in words is "one billion, ninety-one million, seven hundred ninety-five thousand, six hundred nine".