1091960689 has 2 divisors, whose sum is σ = 1091960690. Its totient is φ = 1091960688.

The previous prime is 1091960657. The next prime is 1091960747. The reversal of 1091960689 is 9860691901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 924646464 + 167314225 = 30408^2 + 12935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091960689 - 2⁵ = 1091960657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1091960629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545980344 + 545980345.

It is an arithmetic number, because the mean of its divisors is an integer number (545980345).

Almost surely, 2^1091960689 is an apocalyptic number.

It is an amenable number.

1091960689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091960689 is an equidigital number, since it uses as much as digits as its factorization.

1091960689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 1091960689 is about 33044.8284758750. The cubic root of 1091960689 is about 1029.7591698233.

The spelling of 1091960689 in words is "one billion, ninety-one million, nine hundred sixty thousand, six hundred eighty-nine".