1091907885 has 16 divisors (see below), whose sum is σ = 1803409920. Its totient is φ = 563565120.

The previous prime is 1091907881. The next prime is 1091907907. The reversal of 1091907885 is 5887091901.

It is not a de Polignac number, because 1091907885 - 2² = 1091907881 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091907881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1173630 + ... + 1174559.

It is an arithmetic number, because the mean of its divisors is an integer number (112713120).

Almost surely, 2^1091907885 is an apocalyptic number.

1091907885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1091907885 is a deficient number, since it is larger than the sum of its proper divisors (711502035).

1091907885 is a wasteful number, since it uses less digits than its factorization.

1091907885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2348228.

The product of its (nonzero) digits is 181440, while the sum is 48.

The square root of 1091907885 is about 33044.0294909686. The cubic root of 1091907885 is about 1029.7425708497.

The spelling of 1091907885 in words is "one billion, ninety-one million, nine hundred seven thousand, eight hundred eighty-five".