1091929091 has 16 divisors (see below), whose sum is σ = 1262521728. Its totient is φ = 933340800.

The previous prime is 1091929081. The next prime is 1091929127. The reversal of 1091929091 is 1909291901.

It is a happy number.

It is not a de Polignac number, because 1091929091 - 2¹⁰ = 1091928067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1091929081) 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, 239156 + ... + 243678.

It is an arithmetic number, because the mean of its divisors is an integer number (78907608).

Almost surely, 2^1091929091 is an apocalyptic number.

1091929091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1091929091 is a deficient number, since it is larger than the sum of its proper divisors (170592637).

1091929091 is a wasteful number, since it uses less digits than its factorization.

1091929091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5842.

The product of its (nonzero) digits is 13122, while the sum is 41.

The square root of 1091929091 is about 33044.3503643210. The cubic root of 1091929091 is about 1029.7492370347.

The spelling of 1091929091 in words is "one billion, ninety-one million, nine hundred twenty-nine thousand, ninety-one".