1095891109 has 2 divisors, whose sum is σ = 1095891110. Its totient is φ = 1095891108.

The previous prime is 1095891089. The next prime is 1095891149. The reversal of 1095891109 is 9011985901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 934524900 + 161366209 = 30570^2 + 12703^2 .

It is a cyclic number.

It is not a de Polignac number, because 1095891109 - 2⁹ = 1095890597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1095891149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 547945554 + 547945555.

It is an arithmetic number, because the mean of its divisors is an integer number (547945555).

Almost surely, 2^1095891109 is an apocalyptic number.

It is an amenable number.

1095891109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1095891109 is an equidigital number, since it uses as much as digits as its factorization.

1095891109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 43.

The square root of 1095891109 is about 33104.2460871714. The cubic root of 1095891109 is about 1030.9932007092.

The spelling of 1095891109 in words is "one billion, ninety-five million, eight hundred ninety-one thousand, one hundred nine".