1091645952 has 80 divisors (see below), whose sum is σ = 2929708320. Its totient is φ = 361193472.

The previous prime is 1091645921. The next prime is 1091645953. The reversal of 1091645952 is 2595461901.

It is not an unprimeable number, because it can be changed into a prime (1091645953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210948 + ... + 216060.

It is an arithmetic number, because the mean of its divisors is an integer number (36621354).

Almost surely, 2^1091645952 is an apocalyptic number.

1091645952 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 1091645952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1464854160).

1091645952 is an abundant number, since it is smaller than the sum of its proper divisors (1838062368).

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

1091645952 is an equidigital number, since it uses as much as digits as its factorization.

1091645952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5273 (or 5257 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 42.

The square root of 1091645952 is about 33040.0658594985. The cubic root of 1091645952 is about 1029.6602241198.

The spelling of 1091645952 in words is "one billion, ninety-one million, six hundred forty-five thousand, nine hundred fifty-two".