1090000090 has 16 divisors (see below), whose sum is σ = 2029655880. Its totient is φ = 420965440.

The previous prime is 1090000039. The next prime is 1090000099. The reversal of 1090000090 is 900000901.

It can be written as a sum of positive squares in 4 ways, for example, as 668067409 + 421932681 = 25847^2 + 20541^2 .

It is not an unprimeable number, because it can be changed into a prime (1090000099) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1879021 + ... + 1879600.

Almost surely, 2^1090000090 is an apocalyptic number.

1090000090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1090000090 is a deficient number, since it is larger than the sum of its proper divisors (939655790).

1090000090 is a wasteful number, since it uses less digits than its factorization.

1090000090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3758657.

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 1090000090 is about 33015.1494014490. The cubic root of 1090000090 is about 1029.1424948965.

Adding to 1090000090 its reverse (900000901), we get a palindrome (1990000991).

The spelling of 1090000090 in words is "one billion, ninety million, ninety", and thus it is an aban number and an uban number.