1091048500 has 24 divisors (see below), whose sum is σ = 2382851016. Its totient is φ = 436419200.

The previous prime is 1091048467. The next prime is 1091048507. The reversal of 1091048500 is 58401901.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 90212004 + 1000836496 = 9498^2 + 31636^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091048507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1090549 + ... + 1091548.

It is an arithmetic number, because the mean of its divisors is an integer number (99285459).

Almost surely, 2^1091048500 is an apocalyptic number.

1091048500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091048500 is an abundant number, since it is smaller than the sum of its proper divisors (1291802516).

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

1091048500 is a wasteful number, since it uses less digits than its factorization.

1091048500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2182116 (or 2182104 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1091048500 is about 33031.0232962892. The cubic root of 1091048500 is about 1029.4723473269.

The spelling of 1091048500 in words is "one billion, ninety-one million, forty-eight thousand, five hundred".