1091821962 has 64 divisors (see below), whose sum is σ = 2745105408. Its totient is φ = 283575600.

The previous prime is 1091821961. The next prime is 1091821979. The reversal of 1091821962 is 2691281901.

It is a self number, because there is not a number n which added to its sum of digits gives 1091821962.

It is not an unprimeable number, because it can be changed into a prime (1091821961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46137 + ... + 65667.

It is an arithmetic number, because the mean of its divisors is an integer number (42892272).

Almost surely, 2^1091821962 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091821962, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1372552704).

1091821962 is an abundant number, since it is smaller than the sum of its proper divisors (1653283446).

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

1091821962 is a wasteful number, since it uses less digits than its factorization.

1091821962 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19576 (or 19554 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 1091821962 is about 33042.7293364213. The cubic root of 1091821962 is about 1029.7155597520.

The spelling of 1091821962 in words is "one billion, ninety-one million, eight hundred twenty-one thousand, nine hundred sixty-two".