1090191820 has 12 divisors (see below), whose sum is σ = 2289402864. Its totient is φ = 436076720.

The previous prime is 1090191811. The next prime is 1090191859. The reversal of 1090191820 is 281910901.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27254776 + ... + 27254815.

It is an arithmetic number, because the mean of its divisors is an integer number (190783572).

Almost surely, 2^1090191820 is an apocalyptic number.

1090191820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1090191820 is an abundant number, since it is smaller than the sum of its proper divisors (1199211044).

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

1090191820 is a wasteful number, since it uses less digits than its factorization.

1090191820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54509600 (or 54509598 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 1090191820 is about 33018.0529407777. The cubic root of 1090191820 is about 1029.2028330941.

The spelling of 1090191820 in words is "one billion, ninety million, one hundred ninety-one thousand, eight hundred twenty".