1089775812 has 12 divisors (see below), whose sum is σ = 2542810256. Its totient is φ = 363258600.

The previous prime is 1089775751. The next prime is 1089775831. The reversal of 1089775812 is 2185779801.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1089775812² = 2375222640840518688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45407314 + ... + 45407337.

Almost surely, 2^1089775812 is an apocalyptic number.

1089775812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1089775812 is an abundant number, since it is smaller than the sum of its proper divisors (1453034444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1089775812 is a wasteful number, since it uses less digits than its factorization.

1089775812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90814658 (or 90814656 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 48.

The square root of 1089775812 is about 33011.7526344785. The cubic root of 1089775812 is about 1029.0719047332.

The spelling of 1089775812 in words is "one billion, eighty-nine million, seven hundred seventy-five thousand, eight hundred twelve".