1091896109 has 2 divisors, whose sum is σ = 1091896110. Its totient is φ = 1091896108.

The previous prime is 1091896097. The next prime is 1091896171. The reversal of 1091896109 is 9016981901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1072562500 + 19333609 = 32750^2 + 4397^2 .

It is an emirp because it is prime and its reverse (9016981901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1091896109 - 2²⁰ = 1090847533 is a prime.

It is a super-2 number, since 2×1091896109² = 2384474225698679762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1091896109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091896909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545948054 + 545948055.

It is an arithmetic number, because the mean of its divisors is an integer number (545948055).

Almost surely, 2^1091896109 is an apocalyptic number.

It is an amenable number.

1091896109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091896109 is an equidigital number, since it uses as much as digits as its factorization.

1091896109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 44.

The square root of 1091896109 is about 33043.8513039869. The cubic root of 1091896109 is about 1029.7388689831.

The spelling of 1091896109 in words is "one billion, ninety-one million, eight hundred ninety-six thousand, one hundred nine".