1091225216 has 32 divisors (see below), whose sum is σ = 2179699200. Its totient is φ = 544163584.

The previous prime is 1091225197. The next prime is 1091225227. The reversal of 1091225216 is 6125221901.

It is a tau number, because it is divible by the number of its divisors (32).

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, 37895 + ... + 60153.

It is an arithmetic number, because the mean of its divisors is an integer number (68115600).

Almost surely, 2^1091225216 is an apocalyptic number.

1091225216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1091225216 is a deficient number, since it is larger than the sum of its proper divisors (1088473984).

1091225216 is an equidigital number, since it uses as much as digits as its factorization.

1091225216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22656 (or 22644 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 1091225216 is about 33033.6981883652. The cubic root of 1091225216 is about 1029.5279251844.

The spelling of 1091225216 in words is "one billion, ninety-one million, two hundred twenty-five thousand, two hundred sixteen".