1091381244 has 48 divisors (see below), whose sum is σ = 2670517920. Its totient is φ = 346429440.

The previous prime is 1091381243. The next prime is 1091381251. The reversal of 1091381244 is 4421831901.

It is a happy number.

It is a super-2 number, since 2×1091381244² = 2382226039509975072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091381243) 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, 3924 + ... + 46884.

It is an arithmetic number, because the mean of its divisors is an integer number (55635790).

Almost surely, 2^1091381244 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 1091381244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1335258960).

1091381244 is an abundant number, since it is smaller than the sum of its proper divisors (1579136676).

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

1091381244 is a wasteful number, since it uses less digits than its factorization.

1091381244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43070 (or 43068 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 1091381244 is about 33036.0597529427. The cubic root of 1091381244 is about 1029.5769915993.

The spelling of 1091381244 in words is "one billion, ninety-one million, three hundred eighty-one thousand, two hundred forty-four".