1091019852 has 72 divisors (see below), whose sum is σ = 2975625744. Its totient is φ = 335062656.

The previous prime is 1091019833. The next prime is 1091019871. The reversal of 1091019852 is 2589101901.

It is an interprime number because it is at equal distance from previous prime (1091019833) and next prime (1091019871).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 284983 + ... + 288785.

Almost surely, 2^1091019852 is an apocalyptic number.

1091019852 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 1091019852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1487812872).

1091019852 is an abundant number, since it is smaller than the sum of its proper divisors (1884605892).

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

1091019852 is a wasteful number, since it uses less digits than its factorization.

1091019852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4439 (or 4434 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 1091019852 is about 33030.5896405135. The cubic root of 1091019852 is about 1029.4633368561.

The spelling of 1091019852 in words is "one billion, ninety-one million, nineteen thousand, eight hundred fifty-two".