1091411968 has 84 divisors (see below), whose sum is σ = 2323666422. Its totient is φ = 512491520.

The previous prime is 1091411963. The next prime is 1091412017. The reversal of 1091411968 is 8691141901.

It can be written as a sum of positive squares in 3 ways, for example, as 1052872704 + 38539264 = 32448^2 + 6208^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1091411968.

It is not an unprimeable number, because it can be changed into a prime (1091411963) 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 5 ways as a sum of consecutive naturals, for example, 2367258 + ... + 2367718.

Almost surely, 2^1091411968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091411968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1161833211).

1091411968 is an abundant number, since it is smaller than the sum of its proper divisors (1232254454).

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

1091411968 is an frugal number, since it uses more digits than its factorization.

1091411968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 1091411968 is about 33036.5247566992. The cubic root of 1091411968 is about 1029.5866528815.

The spelling of 1091411968 in words is "one billion, ninety-one million, four hundred eleven thousand, nine hundred sixty-eight".