1091359872 has 128 divisors (see below), whose sum is σ = 3232747200. Its totient is φ = 362465280.

The previous prime is 1091359861. The next prime is 1091359873. The reversal of 1091359872 is 2789531901.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (1091359873) 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, 1579047 + ... + 1579737.

Almost surely, 2^1091359872 is an apocalyptic number.

1091359872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091359872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1616373600).

1091359872 is an abundant number, since it is smaller than the sum of its proper divisors (2141387328).

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

1091359872 is an equidigital number, since it uses as much as digits as its factorization.

1091359872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171 (or 1153 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 1091359872 is about 33035.7362866336. The cubic root of 1091359872 is about 1029.5702709832.

The spelling of 1091359872 in words is "one billion, ninety-one million, three hundred fifty-nine thousand, eight hundred seventy-two".