1109091285 has 40 divisors (see below), whose sum is σ = 1998384696. Its totient is φ = 588470400.

The previous prime is 1109091281. The next prime is 1109091311. The reversal of 1109091285 is 5821909011.

It can be written as a sum of positive squares in 4 ways, for example, as 585688401 + 523402884 = 24201^2 + 22878^2 .

It is not a de Polignac number, because 1109091285 - 2² = 1109091281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109091281) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 72835 + ... + 86735.

Almost surely, 2^1109091285 is an apocalyptic number.

1109091285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1109091285 is a deficient number, since it is larger than the sum of its proper divisors (889293411).

1109091285 is a wasteful number, since it uses less digits than its factorization.

1109091285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14115 (or 14106 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 1109091285 is about 33303.0221601584. The cubic root of 1109091285 is about 1035.1161810348.

The spelling of 1109091285 in words is "one billion, one hundred nine million, ninety-one thousand, two hundred eighty-five".